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CVE-2026-7422

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

Published: Apr 29, 2026Updated: May 4, 2026 Sources: CVE List NVDCWE-290
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 92.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-290

Affected Products

FreeRTOS-Plus-TCPAWS
Mixed
Cloud & SaaS / cloud-platform
freertos-plus-tcpamazon
SaaS
Cloud & SaaS / cloud-platform
awscommercialUSCloud & SaaSaka aws
amazoncommercialUSCloud & SaaS

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
github.com
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
github.com
https://aws.amazon.com/security/security-bulletins/2026-021-aws/
aws.amazon.com
and 1 more references View all →

Timeline

Published
Apr 29, 2026
Last Updated
May 4, 2026

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