Description

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.

INFO

Published Date :

2026-04-29T18:36:28.353Z

Last Modified :

2026-04-29T19:08:11.602Z

Source :

AMZN
AFFECTED PRODUCTS

The following products are affected by CVE-2026-7423 vulnerability.

Vendors Products
Amazon
  • Freertos-plus-tcp
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-7423.

URL Resource
https://aws.amazon.com/security/security-bulletins/2026-021-aws/ cve-icon cve-icon
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 cve-icon cve-icon
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 cve-icon cve-icon
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact