CVE-2025-5688

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductFreeRTOS

PublishedJun 4, 2025

First seenJun 4, 2025

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

Amazon FreeRTOS4.3.2 or later

Patches

github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.2

Vendor advisories

aws.amazon.com/security/security-bulletins/AWS-2025-012/
github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-5x4f-fvv8-wr65

Affected products

Product	Affected versions	Fixed in
Amazon FreeRTOS	2.3.4 ≤ v < 4.3.2	4.3.2

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