CVE-2026-7422 — Insufficient packet validation in FreeRTOS-Plus-TCP before

title: CVE-2026-7422 - FreeRTOS-Plus-TCP Spoofed MAC Address
id: scw-2026-04-29-ai-1
status: experimental
level: critical
description: |
  Detects network traffic where the source MAC address is spoofed to match a local endpoint's registered MAC address, bypassing checksum and minimum-size validation in FreeRTOS-Plus-TCP versions prior to V4.2.6 and V4.4.1. This bypass allows an adjacent attacker to potentially inject malicious packets.
author: SCW Feed Engine (AI-generated)
date: 2026-04-29
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7422/
tags:
  - attack.lateral_movement
  - attack.t1071.001
logsource:
    category: firewall
detection:
  selection:
      src_ip|exists:
          - "true"
      dst_ip|exists:
          - "true"
      dst_port|exists:
          - "true"
      action|contains:
          - "allow"
      condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse