CVE-2026-7422

7.1 HIGH 0.2% exploit odds Fix listed Other

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.

At a glance

Exploitability: Can be exploited from the same network segment without logging in. High risk of data tampering.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-04-29 19:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-26 20:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-04-29 19:16 UTC
Last modified: 2026-10-26 20:10 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-290
Record status: Analyzed

Affected

Amazon freertos-plus-tcp < 4.2.6
Amazon freertos-plus-tcp < 4.4.1

Attack profile CVSS 4.0 · 7.1

Attack vector: Adjacent network
Complexity: Low
Attack requirements: None
Privileges needed: None
User interaction: None
Confidentiality: None
Integrity: High
Availability: None

Raw 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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Fix and advisories

References

NVD record · CVE.org record