CVE-2026-7422CWE-290

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

High · published April 29, 2026

CVSS v4.0
7.1
EPSS
0%
Percentile
19.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00285 · 19.9th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-04-29T18:35Z
EPSS history
Timeline
  • 29 APR 18:35Z
    MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing
    cvelistv5