CVE-2026-7422

HIGH EPSS 7.5%
Published Apr 29, 20262mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 4.0
High
Find Similar
Published Apr 29, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
7.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-290

Affected Products 2

VendorProductVersionRange
amazonfreertos-plus-tcp*≥4.0.0  –  <4.2.6
amazonfreertos-plus-tcp*≥4.3.0  –  <4.4.1

References 4

  • aws.amazon.com https://aws.amazon.com/security/security-bulletins/2026-021-aws/
    Vendor Advisory
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9
    PatchVendor Advisory

Remediation

  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9
    PatchVendor Advisory