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CVE-2026-7422

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

MEDIUM
6.5
CVSS Score
Published: April 29, 2026 at 06:35 PM UTC
Updated: October 26, 2026 at 08:10 PM UTC
3 products affected across 3 vendorsFreertos Plus TCPFreeRTOS-Plus-TCPFreeRTOS-Plus-TCP

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Freertos Plus TCP· Amazon
95%
4.0.0 ≤ v < 4.2.64.3.0 ≤ v < 4.4.1
FreeRTOS-Plus-TCP· AWS
90%
4.0.0 ≤ v < 4.2.64.3.0 ≤ v < 4.4.14.0.04.3.0
Vendor states this is fixed in 4.2.6 (unaffected)
Vendor states this is fixed in 4.4.1 (unaffected)
FreeRTOS-Plus-TCP· Freertos
85%
All versions

References (4)

PatchRelease Notes
Source: cverecord
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
PatchRelease Notes
Source: cverecord
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
Vendor Advisory
Source: cverecord
https://aws.amazon.com/security/security-bulletins/2026-021-aws/
Third Party AdvisoryPatchVendor Advisory
Source: cverecord
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMAMZN
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-290

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