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VulnerabilityPublished

CVE-2026-7422: AWS FreeRTOS-Plus-TCP · Authentication Bypass by Spoofing

Affects AWS FreeRTOS-Plus-TCPSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 4.4.1 or 4.2.6 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.4.1, 4.2.6
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade AWS FreeRTOS-Plus-TCP to 4.4.1 or 4.2.6.

Affected software

ProductAffectedFixed in
AWSFreeRTOS-Plus-TCPAffected
  • >=4.3.0 <4.4.1
Fixed in
  • 4.4.1
AWSFreeRTOS-Plus-TCPAffected
  • >=4.0.0 <4.2.6
Fixed in
  • 4.2.6
GitHubfreertos/FreeRTOS-Plus-TCPpkg:github/freertos/FreeRTOS-Plus-TCPOther threatsAffected
  • =4.0.0
  • =4.3.0
Fixed in–
GitHubFreeRTOS-Plus-TCPpkg:github/FreeRTOS-Plus-TCPOther threatsAffected
  • >=4.0.0 <4.2.6
  • >=4.3.0 <4.4.1
Fixed in
  • 4.2.6
  • 4.4.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and users should upgrade to AWS FreeRTOS-Plus-TCP version 4.2.6 or 4.4.1 to remediate this vulnerability. Since this is a software component, applying the official fixed versions is the recommended mitigation. No other vendor advisory indicates alternative mitigations or that the issue is already mitigated.

Description

CVE-2026-7422 is an authentication bypass vulnerability in AWS FreeRTOS-Plus-TCP affecting versions before 4.2.6 and 4.4.1. The flaw allows an adjacent network attacker to bypass checksum and minimum-size packet validation by spoofing the Ethernet source MAC address to match a device's own registered endpoint. This occurs because the loopback detection mechanism skips input validation for packets with a source MAC matching a local endpoint. The vulnerability has a medium severity with a CVSS score of 6.5. Fixed versions 4.2.6 and 4.4.1 are available to mitigate the issue.

References

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