An exploitable memory corruption vulnerability exists in the Websocket protocol implementation of Cesanta Mongoose 6.8. A specially crafted websocket packet can cause an integer overflow, leading to a heap buffer overflow and resulting in denial of service and potential remote code execution. An attacker needs to send a specially crafted websocket packet over network to trigger this vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-2921
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0428