CVE-2025-5688

Summary

We have identified a buffer overflow issue allowing out-of-bounds write when processing LLMNR or mDNS queries with very long DNS names. This issue only affects systems using Buffer Allocation Scheme 1 with LLMNR or mDNS enabled.

Users should upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.

Affected Software

Weaknesses

• CWE-787: CWE-787: Out-of-bounds Write

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://aws.amazon.com/security/security-bulletins/AWS-2025-012/
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.2
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-5x4f-fvv8-wr65

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