Vulnerability details

CVE-2026-102551

FreeRTOS FreeRTOS-Plus-TCP

Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling

CVSS 4.0

9.2Critical

Official description

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.

CVSS scores

Score	Version	Source	Vector
9.2Critical	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N`
7.7High	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L`

Affected products

Vendor	Product	Versions	Source
FreeRTOS	FreeRTOS-Plus-TCP	v ≤ 4.4.1	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2 release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-139-aws/ vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pv third-party-advisory

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Details

Published: 2026-10-16
Last updated: 2026-10-19
State: Published
Assigner (CNA): AMZN
Kolun priority: 19 · Low

Exploit prediction (EPSS)

0.27%

Probability of exploitation in 30 days

19.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-940
Improper verification of source of a communication channel