Description

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.

Classification

CVE ID: CVE-2025-5688

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected Products

Vendor: Amazon

Product: FreeRTOS

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.68% (scored less or equal to compared to others)

EPSS Date: 2025-06-06 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-5688
https://aws.amazon.com/security/security-bulletins/AWS-2025-012/

Timeline