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CVE-2025-5688

Out of Bounds Write in FreeRTOS-Plus-TCP

HIGH
7.5
CVSS Score
Published: June 4, 2025 at 05:09 PM UTC
Updated: June 17, 2026 at 09:48 AM UTC
2 products affected across 2 vendorsFreeRTOS-Plus-TCPFreeRTOS

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FreeRTOS-Plus-TCP· Freertos
85%
All versions
FreeRTOS· Amazon
60%
2.3.4 ≤ v < 4.3.22.3.4
Affected range stops below 4.3.2, so it looks safe — our inference, not a vendor statement

References (3)

Vendor Advisory
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
https://aws.amazon.com/security/security-bulletins/AWS-2025-012/
Patch
Source: cverecord
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.2
Vendor Advisory
Source: cverecord
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-5x4f-fvv8-wr65

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHAMZN
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-787

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