CVE-2026-7422: AWS FreeRTOS-Plus-TCP · Authentication Bypass by Spoofing
Affects AWS FreeRTOS-Plus-TCPSource CVE Database V5
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
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| AWSFreeRTOS-Plus-TCP | Affected
| Fixed in
|
| AWSFreeRTOS-Plus-TCP | Affected
| Fixed in
|
GitHubfreertos/FreeRTOS-Plus-TCPpkg:github/freertos/FreeRTOS-Plus-TCPOther threats | Affected
| Fixed in– |
GitHubFreeRTOS-Plus-TCPpkg:github/FreeRTOS-Plus-TCPOther threats | Affected
| Fixed in
|
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
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 (opens in a new tab)
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 (opens in a new tab)
- aws.amazon.com/security/security-bulletins/2026-021-aws/ (opens in a new tab)
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9 (opens in a new tab)