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9.4

FreeRTOS-Plus-TCP may accept fake IPv6 router messages

CVE-2026-102551 · published 12 days ago
Summary

The IPv6 router advertisement feature in FreeRTOS‑Plus‑TCP can be tricked by a malicious network source, allowing it to change the device’s default gateway and address settings. This could let an attacker redirect traffic or disrupt network communication. Update the software to version V4.4.2 to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
freertos freertos-plus-tcp <= 4.4.1
Original advisory text
Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling
Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.



To remediate this issue, users should upgrade to version V4.4.2.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-940Improper Verification of Source of a Communication Channel
Timeline
Published16 Oct 2026
Updated28 Oct 2026
First seen16 Oct 2026
Sources
CVE-2026-102551 · NVD
CVE-2026-102551 · MITRE
CVE-2026-102551 · OSV
GHSA-pjq5-fqrr-g6pv · GHSA
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