CVE-2026-7422

MEDIUM

MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing

Title source: cna

Description

Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint. To mitigate this issue, users should upgrade to the fixed version when available.

References (4)

[Patch] https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1

[Patch] https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6

[Vendor Advisory] https://aws.amazon.com/security/security-bulletins/2026-021-aws/

[Third Party Advisory] https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9

Scores

CVSS v3 6.5

EPSS 0.0002

EPSS Percentile 3.8%

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-290

Status published

Products (4)

AWS/FreeRTOS-Plus-TCP 4.0.0 - 4.2.6

AWS/FreeRTOS-Plus-TCP 4.2.6

AWS/FreeRTOS-Plus-TCP 4.3.0 - 4.4.1

AWS/FreeRTOS-Plus-TCP 4.4.1

Published Apr 29, 2026

Tracked Since Apr 30, 2026