What is CVE-2026-7422?

CVE-2026-7422 is a medium-severity vulnerability in Amazon Freertos-plus-tcp, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2026-04-29.

How severe is CVE-2026-7422?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Amazon Freertos-plus-tcp

CVE-2026-7422

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 r…

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Amazon Freertos-plus-tcp
Aws Freertos-plus-tcp — versions 4.0.0, 4.3.0, 4.2.6

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch, Release Notes)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch, Release Notes)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (Patch, third-party-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-7422?: CVE-2026-7422 is a medium-severity vulnerability in Amazon Freertos-plus-tcp, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2026-04-29.
How severe is CVE-2026-7422?: Medium severity. CVSS v3 base score is 6.5 out of 10.