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CVE-2025-5688

HighPublished

Out of Bounds Write in FreeRTOS-Plus-TCP

Published: Jun 4, 2025
Updated: Oct 14, 2025
Assigning CNA: AMZN
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 28.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2025-5688-FreeRTOS-Plus-TCP-Out-of-Bounds-WritePoC
PoC exploit for CVE-2025-5688: remote out-of-bounds write in FreeRTOS-Plus-TCP via crafted LLMNR/mDNS queries, causing crash or potential RCE on vulnerable IoT devices.

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