CVE-2026-7423
5.3
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.
To mitigate this issue, users should upgrade to the fixed version when available.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | FreeRTOS-Plus-TCP | 4.0.0 < 4.2.6 | affected |
| AWS | FreeRTOS-Plus-TCP | 4.3.0 < 4.4.1 | affected |
| AWS | FreeRTOS-Plus-TCP | 4.2.6 | unaffected |
| AWS | FreeRTOS-Plus-TCP | 4.4.1 | unaffected |
Weaknesses
- CWE-191: CWE-191: Integer Underflow (Wrap or Wraparound)
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
- https://aws.amazon.com/security/security-bulletins/2026-021-aws/
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r
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