diff --git a/Marlin/Conditionals.h b/Marlin/Conditionals.h
index 1c6aa9abcd02..6b8a682ac62e 100644
--- a/Marlin/Conditionals.h
+++ b/Marlin/Conditionals.h
@@ -284,6 +284,12 @@
     #define HardwareSerial_h // trick to disable the standard HWserial
   #endif
 
+  #if ENABLED(EMERGENCY_PARSER)
+    #define EMERGENCY_PARSER_CAPABILITIES " EMERGENCY_CODES:M108,M112,M410"
+  #else
+    #define EMERGENCY_PARSER_CAPABILITIES ""
+  #endif
+
   #include "Arduino.h"
 
   /**
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 3a673a673493..93ca69391887 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/Marlin.h b/Marlin/Marlin.h
index 616a8bf357bb..9d40ce1615cb 100644
--- a/Marlin/Marlin.h
+++ b/Marlin/Marlin.h
@@ -288,6 +288,7 @@ extern float sw_endstop_min[3]; // axis[n].sw_endstop_min
 extern float sw_endstop_max[3]; // axis[n].sw_endstop_max
 extern bool axis_known_position[3]; // axis[n].is_known
 extern bool axis_homed[3]; // axis[n].is_homed
+extern bool wait_for_heatup;
 
 // GCode support for external objects
 bool code_seen(char);
diff --git a/Marlin/MarlinSerial.cpp b/Marlin/MarlinSerial.cpp
index e6362fc7c78c..7f1920528acc 100644
--- a/Marlin/MarlinSerial.cpp
+++ b/Marlin/MarlinSerial.cpp
@@ -30,6 +30,7 @@
 
 #include "Marlin.h"
 #include "MarlinSerial.h"
+#include "stepper.h"
 
 #ifndef USBCON
 // this next line disables the entire HardwareSerial.cpp,
@@ -54,6 +55,10 @@ FORCE_INLINE void store_char(unsigned char c) {
       rx_buffer.head = i;
     }
   CRITICAL_SECTION_END;
+
+  #if ENABLED(EMERGENCY_PARSER)
+    emergency_parser(c);
+  #endif
 }
 
 
@@ -310,3 +315,156 @@ MarlinSerial customizedSerial;
 #if defined(USBCON) && ENABLED(BLUETOOTH)
   HardwareSerial bluetoothSerial;
 #endif
+
+#if ENABLED(EMERGENCY_PARSER)
+
+  // Currently looking for: M108, M112, M410
+  // If you alter the parser please don't forget to update the capabilities in Conditionals.h
+
+  void emergency_parser(unsigned char c) {
+
+    enum e_parser_state {
+      state_RESET,
+      state_M,
+      state_M1,
+      state_M10,
+      state_M11,
+      state_M2,
+      state_M3,
+      state_M4,
+      state_M41,
+      state_IGNORE // to '\n'
+    };
+
+    static e_parser_state state = state_RESET;
+
+    switch (state) {
+      case state_RESET:
+        switch (c) {
+          case 'M':
+            state = state_M;
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M:
+        switch (c) {
+          case '1':
+            state = state_M1;
+            break;
+          case '2':
+            state = state_M2;
+            break;
+          case '3':
+            state = state_M3;
+            break;
+          case '4':
+            state = state_M4;
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M1:
+        switch (c) {
+          case '0':
+            state = state_M10;
+            break;
+          case '1':
+            state = state_M11;
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M2:
+        switch (c) {
+          case '3': // M23
+          case '8': // M28
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M3:
+        switch (c) {
+          case '0': // M30
+          case '2': // M32
+          case '3': // M33
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M10:
+        switch (c) {
+          case '8': // M108
+            { state = state_RESET; wait_for_heatup = false; }
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M11:
+        switch (c) {
+          case '2': // M112
+            state = state_RESET; kill(PSTR(MSG_KILLED));
+            break;
+          case '7': // M117
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M4:
+        switch (c) {
+          case '1':
+            state = state_M41;
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_M41:
+        switch (c) {
+          case '0':
+            { state = state_RESET; stepper.quick_stop(); }
+            break;
+          case ';':
+            state = state_IGNORE;
+            break;
+          default: state = state_RESET;
+        }
+      break;
+
+      case state_IGNORE:
+        if (c == '\n') state = state_RESET;
+      break;
+
+      default:
+        state = state_RESET;
+    }
+  }
+#endif
diff --git a/Marlin/MarlinSerial.h b/Marlin/MarlinSerial.h
index 34d234615640..b27b98169ac7 100644
--- a/Marlin/MarlinSerial.h
+++ b/Marlin/MarlinSerial.h
@@ -101,6 +101,11 @@ struct ring_buffer {
   extern ring_buffer rx_buffer;
 #endif
 
+#if ENABLED(EMERGENCY_PARSER)
+  #include "language.h"
+  void emergency_parser(unsigned char c);
+#endif
+
 class MarlinSerial { //: public Stream
 
   public:
@@ -141,6 +146,10 @@ class MarlinSerial { //: public Stream
             rx_buffer.head = i;
           }
         CRITICAL_SECTION_END;
+
+        #if ENABLED(EMERGENCY_PARSER)
+          emergency_parser(c);
+        #endif
       }
     }
 
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 836b5431130d..ab7ef8f05d8e 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -160,7 +160,7 @@
  * M105 - Read current temp
  * M106 - Fan on
  * M107 - Fan off
- * M108 - Cancel heatup and wait for the hotend and bed, this G-code is asynchronously handled in the get_serial_commands() parser
+ * M108 - Stop the waiting for heaters in M109, M190, M303. Does not affect the target temperature.
  * M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating
  *        Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
  *        IF AUTOTEMP is enabled, S<mintemp> B<maxtemp> F<factor>. Exit autotemp by any M109 without F
@@ -1105,9 +1105,12 @@ inline void get_serial_commands() {
         }
       }
 
-      // If command was e-stop process now
-      if (strcmp(command, "M112") == 0) kill(PSTR(MSG_KILLED));
-      if (strcmp(command, "M108") == 0) wait_for_heatup = false;
+      #if DISABLED(EMERGENCY_PARSER)
+        // If command was e-stop process now
+        if (strcmp(command, "M108") == 0) wait_for_heatup = false;
+        if (strcmp(command, "M112") == 0) kill(PSTR(MSG_KILLED));
+        if (strcmp(command, "M410") == 0) stepper.quick_stop();
+      #endif
 
       #if defined(NO_TIMEOUTS) && NO_TIMEOUTS > 0
         last_command_time = ms;
@@ -4533,10 +4536,14 @@ inline void gcode_M105() {
 
 #endif // FAN_COUNT > 0
 
-/**
- * M108: Cancel heatup and wait for the hotend and bed, this G-code is asynchronously handled in the get_serial_commands() parser
- */
-inline void gcode_M108() { wait_for_heatup = false; }
+#if DISABLED(EMERGENCY_PARSER)
+
+  /**
+   * M108: Stop the waiting for heaters in M109, M190, M303. Does not affect the target temperature.
+   */
+  inline void gcode_M108() { wait_for_heatup = false; }
+
+#endif
 
 /**
  * M109: Sxxx Wait for extruder(s) to reach temperature. Waits only when heating.
@@ -4811,7 +4818,9 @@ inline void gcode_M111() {
 /**
  * M112: Emergency Stop
  */
-inline void gcode_M112() { kill(PSTR(MSG_KILLED)); }
+#if DISABLED(EMERGENCY_PARSER)
+  inline void gcode_M112() { kill(PSTR(MSG_KILLED)); }
+#endif
 
 #if ENABLED(HOST_KEEPALIVE_FEATURE)
 
@@ -5991,13 +6000,15 @@ inline void gcode_M400() { stepper.synchronize(); }
  * This will stop the carriages mid-move, so most likely they
  * will be out of sync with the stepper position after this.
  */
-inline void gcode_M410() {
-  stepper.quick_stop();
-  #if DISABLED(DELTA) && DISABLED(SCARA)
-    set_current_position_from_planner();
-  #endif
-}
 
+#if DISABLED(EMERGENCY_PARSER)
+  inline void gcode_M410() {
+    stepper.quick_stop();
+    #if DISABLED(DELTA) && DISABLED(SCARA)
+      set_current_position_from_planner();
+    #endif
+  }
+#endif
 
 #if ENABLED(MESH_BED_LEVELING)
 
@@ -6953,9 +6964,11 @@ void process_next_command() {
         gcode_M111();
         break;
 
-      case 112: // M112: Emergency Stop
-        gcode_M112();
-        break;
+      #if DISABLED(EMERGENCY_PARSER)
+        case 112: // M112: Emergency Stop
+          gcode_M112();
+          break;
+      #endif
 
       #if ENABLED(HOST_KEEPALIVE_FEATURE)
 
@@ -6974,9 +6987,11 @@ void process_next_command() {
         KEEPALIVE_STATE(NOT_BUSY);
         return; // "ok" already printed
 
-      case 108:
-        gcode_M108();
-        break;
+      #if DISABLED(EMERGENCY_PARSER)
+        case 108:
+          gcode_M108();
+          break;
+      #endif
 
       case 109: // M109: Wait for temperature
         gcode_M109();
@@ -7261,9 +7276,11 @@ void process_next_command() {
           break;
       #endif // ENABLED(FILAMENT_WIDTH_SENSOR)
 
-      case 410: // M410 quickstop - Abort all the planned moves.
-        gcode_M410();
-        break;
+      #if DISABLED(EMERGENCY_PARSER)
+        case 410: // M410 quickstop - Abort all the planned moves.
+          gcode_M410();
+          break;
+      #endif
 
       #if ENABLED(MESH_BED_LEVELING)
         case 420: // M420 Enable/Disable Mesh Bed Leveling
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index b075cd4c7b95..3200982a0e88 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -579,6 +579,13 @@
 #endif
 
 /**
+ * emergency-command parser
+ */
+#if ENABLED(EMERGENCY_PARSER) && ENABLED(USBCON)
+  #error "EMERGENCY_PARSER does not work on boards with AT90USB processors (USBCON)."
+#endif
+
+ /**
  * Warnings for old configurations
  */
 #if WATCH_TEMP_PERIOD > 500
diff --git a/Marlin/example_configurations/Cartesio/Configuration_adv.h b/Marlin/example_configurations/Cartesio/Configuration_adv.h
index d17635221200..e1848a3ed880 100644
--- a/Marlin/example_configurations/Cartesio/Configuration_adv.h
+++ b/Marlin/example_configurations/Cartesio/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/Felix/Configuration_adv.h b/Marlin/example_configurations/Felix/Configuration_adv.h
index ffad119958a7..b46c497787df 100644
--- a/Marlin/example_configurations/Felix/Configuration_adv.h
+++ b/Marlin/example_configurations/Felix/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/Hephestos/Configuration_adv.h b/Marlin/example_configurations/Hephestos/Configuration_adv.h
index 8956c41cd1eb..48c0c4b5a462 100644
--- a/Marlin/example_configurations/Hephestos/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
index 704b20ce4066..bfd8b9a921fa 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/K8200/Configuration_adv.h b/Marlin/example_configurations/K8200/Configuration_adv.h
index 1a00bb37615e..9476e5b3bd4d 100644
--- a/Marlin/example_configurations/K8200/Configuration_adv.h
+++ b/Marlin/example_configurations/K8200/Configuration_adv.h
@@ -526,6 +526,12 @@ const unsigned int dropsegments = 2; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/K8400/Configuration_adv.h b/Marlin/example_configurations/K8400/Configuration_adv.h
index 29b759d17b23..1c73ae074ce7 100644
--- a/Marlin/example_configurations/K8400/Configuration_adv.h
+++ b/Marlin/example_configurations/K8400/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 26
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/RigidBot/Configuration_adv.h b/Marlin/example_configurations/RigidBot/Configuration_adv.h
index e1280f2d2ef9..bf798bb8f17d 100644
--- a/Marlin/example_configurations/RigidBot/Configuration_adv.h
+++ b/Marlin/example_configurations/RigidBot/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 8
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index 475e0335a44a..f743b660896e 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/TAZ4/Configuration_adv.h b/Marlin/example_configurations/TAZ4/Configuration_adv.h
index 1a6ab806ac57..a4309db767a7 100644
--- a/Marlin/example_configurations/TAZ4/Configuration_adv.h
+++ b/Marlin/example_configurations/TAZ4/Configuration_adv.h
@@ -528,6 +528,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/WITBOX/Configuration_adv.h b/Marlin/example_configurations/WITBOX/Configuration_adv.h
index 8956c41cd1eb..48c0c4b5a462 100644
--- a/Marlin/example_configurations/WITBOX/Configuration_adv.h
+++ b/Marlin/example_configurations/WITBOX/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h b/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
index 894e861633e6..a19e75beda9d 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
@@ -522,6 +522,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/delta/generic/Configuration_adv.h b/Marlin/example_configurations/delta/generic/Configuration_adv.h
index fba00960a25e..fcd0d9f1cc6d 100644
--- a/Marlin/example_configurations/delta/generic/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/generic/Configuration_adv.h
@@ -522,6 +522,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
index 7265b76284a6..d634ce5ab1ed 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
@@ -521,6 +521,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
index 69eb9ce95659..f508233ef95c 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
@@ -526,6 +526,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
index f224fd60e7a4..796966872536 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
@@ -522,6 +522,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index 857f320e4666..f266d270ee65 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
index 69ee6e04b5c2..ade737a739c5 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
@@ -520,6 +520,12 @@ const unsigned int dropsegments = 5; //everything with less than this number of
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Enable an emergency-command parser to intercept certain commands as they
+// enter the serial receive buffer, so they cannot be blocked.
+// Currently handles M108, M112, M410
+// Does not work on boards using AT90USB (USBCON) processors!
+//#define EMERGENCY_PARSER
+
 // Bad Serial-connections can miss a received command by sending an 'ok'
 // Therefore some clients abort after 30 seconds in a timeout.
 // Some other clients start sending commands while receiving a 'wait'.
diff --git a/Marlin/language.h b/Marlin/language.h
index eb378feea084..03c063d4fb7c 100644
--- a/Marlin/language.h
+++ b/Marlin/language.h
@@ -128,7 +128,7 @@
 #define MSG_INVALID_EXTRUDER                "Invalid extruder"
 #define MSG_INVALID_SOLENOID                "Invalid solenoid"
 #define MSG_ERR_NO_THERMISTORS              "No thermistors - no temperature"
-#define MSG_M115_REPORT                     "FIRMWARE_NAME:Marlin " DETAILED_BUILD_VERSION " SOURCE_CODE_URL:" SOURCE_CODE_URL " PROTOCOL_VERSION:" PROTOCOL_VERSION " MACHINE_TYPE:" MACHINE_NAME " EXTRUDER_COUNT:" STRINGIFY(EXTRUDERS) " UUID:" MACHINE_UUID "\n"
+#define MSG_M115_REPORT                     "FIRMWARE_NAME:Marlin " DETAILED_BUILD_VERSION " SOURCE_CODE_URL:" SOURCE_CODE_URL " PROTOCOL_VERSION:" PROTOCOL_VERSION " MACHINE_TYPE:" MACHINE_NAME " EXTRUDER_COUNT:" STRINGIFY(EXTRUDERS) " UUID:" MACHINE_UUID EMERGENCY_PARSER_CAPABILITIES "\n"
 #define MSG_COUNT_X                         " Count X: "
 #define MSG_COUNT_A                         " Count A: "
 #define MSG_ERR_KILLED                      "Printer halted. kill() called!"
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index a011b77d2da9..fb9b40cf0ffe 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -238,8 +238,10 @@ unsigned char Temperature::soft_pwm[HOTENDS];
       soft_pwm_bed = bias = d = (MAX_BED_POWER) / 2;
     #endif
 
+    wait_for_heatup = true;
+
     // PID Tuning loop
-    for (;;) {
+    while (wait_for_heatup) {
 
       millis_t ms = millis();
 
@@ -421,6 +423,7 @@ unsigned char Temperature::soft_pwm[HOTENDS];
       }
       lcd_update();
     }
+    if (!wait_for_heatup) disable_all_heaters();
   }
 
 #endif // HAS_PID_HEATING