diff --git a/vulnerabilities/api.py b/vulnerabilities/api.py
index af8e5d889..9e0c347c2 100644
--- a/vulnerabilities/api.py
+++ b/vulnerabilities/api.py
@@ -22,6 +22,7 @@
 from vulnerabilities.models import Vulnerability
 from vulnerabilities.models import VulnerabilityReference
 from vulnerabilities.models import VulnerabilitySeverity
+from vulnerabilities.models import Weakness
 from vulnerabilities.models import get_purl_query_lookups
 from vulnerabilities.throttling import StaffUserRateThrottle
 
@@ -96,8 +97,17 @@ class Meta:
         fields = ["url", "vulnerability_id", "summary", "references", "fixed_packages", "aliases"]
 
 
-class VulnerabilitySerializer(serializers.HyperlinkedModelSerializer):
+class WeaknessSerializer(serializers.HyperlinkedModelSerializer):
+    """
+    Used for nesting inside weakness focused APIs.
+    """
+
+    class Meta:
+        model = Weakness
+        fields = ["cwe_id", "name", "description"]
+
 
+class VulnerabilitySerializer(serializers.HyperlinkedModelSerializer):
     fixed_packages = MinimalPackageSerializer(
         many=True, source="filtered_fixed_packages", read_only=True
     )
@@ -105,6 +115,7 @@ class VulnerabilitySerializer(serializers.HyperlinkedModelSerializer):
 
     references = VulnerabilityReferenceSerializer(many=True, source="vulnerabilityreference_set")
     aliases = AliasSerializer(many=True, source="alias")
+    weaknesses = WeaknessSerializer(many=True)
 
     class Meta:
         model = Vulnerability
@@ -116,6 +127,7 @@ class Meta:
             "fixed_packages",
             "affected_packages",
             "references",
+            "weaknesses",
         ]
 
 
@@ -336,11 +348,12 @@ def get_queryset(self):
         to a custom attribute `filtered_fixed_packages`
         """
         return Vulnerability.objects.prefetch_related(
+            "weaknesses",
             Prefetch(
                 "packages",
                 queryset=self.get_fixed_packages_qs(),
                 to_attr="filtered_fixed_packages",
-            )
+            ),
         )
 
     serializer_class = VulnerabilitySerializer
diff --git a/vulnerabilities/tests/test_api.py b/vulnerabilities/tests/test_api.py
index d02808e16..366951f9b 100644
--- a/vulnerabilities/tests/test_api.py
+++ b/vulnerabilities/tests/test_api.py
@@ -26,6 +26,7 @@
 from vulnerabilities.models import Vulnerability
 from vulnerabilities.models import VulnerabilityReference
 from vulnerabilities.models import VulnerabilityRelatedReference
+from vulnerabilities.models import Weakness
 
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 TEST_DATA = os.path.join(BASE_DIR, "test_data")
@@ -197,6 +198,8 @@ def setUp(self):
             PackageRelatedVulnerability.objects.create(
                 package=pkg, vulnerability=self.vulnerability, fix=True
             )
+        self.weaknesses = Weakness.objects.create(cwe_id=119)
+        self.weaknesses.vulnerabilities.add(self.vulnerability)
 
     def test_api_status(self):
         response = self.csrf_client.get("/api/vulnerabilities/")
@@ -229,6 +232,13 @@ def test_api_with_single_vulnerability(self):
             ],
             "affected_packages": [],
             "references": [],
+            "weaknesses": [
+                {
+                    "cwe_id": 119,
+                    "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer",
+                    "description": "The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.",
+                }
+            ],
         }
 
     def test_api_with_single_vulnerability_with_filters(self):
@@ -249,6 +259,13 @@ def test_api_with_single_vulnerability_with_filters(self):
             ],
             "affected_packages": [],
             "references": [],
+            "weaknesses": [
+                {
+                    "cwe_id": 119,
+                    "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer",
+                    "description": "The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.",
+                }
+            ],
         }