Windows DNS Client Buffer Overflow via LLMNR/mDNS (CVE-2025-5688)
CVE-2025-5688 Published on June 4, 2025
Out of Bounds Write in FreeRTOS-Plus-TCP
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.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2025-5688 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2025-5688
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Affected Versions
Amazon FreeRTOS:- Version 2.3.4 and below 4.3.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.