CVE-2026-102551CWE-940

CVE-2026-102551

High · published October 16, 2026

CVSS v3.1
7.7
EPSS
0%
Percentile
18.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CVSS v4.0
9.2 · 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
EPSS
0.00273 · 18.7th percentile
Weakness
CWE-940 · Improper Verification of Source of a Communication Channel
Published
2026-10-16T22:17Z
References (3)
https://aws.amazon.com/security/security-bulletins/2026-139-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2 · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pv · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:27Z
    Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling
    cvelistv5
  • 16 OCT 17:27Z
    Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling
    cvelistv5