CVE-2026-102552CWE-940

CVE-2026-102552

Medium · published October 16, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
13.5
In the wild
Unconfirmed
What it is

Improper verification of the source of a communication channel in the DNS resolver in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow remote third-party to insert a chosen address into the device's DNS cache via a forged DNS reply.

To remediate this issue, users should upgrade to version V4.4.2 and enable ipconfigDNS_CHECK_REPLY_SOURCE_IP.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
8.2 · CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00233 · 13.5th 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-h4fw-pv82-p7h5 · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:28Z
    Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver
    cvelistv5
  • 16 OCT 17:28Z
    Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver
    cvelistv5