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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-7423 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  AMZN
CVSS-B 6.0 MEDIUM
Vector:  CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-021-aws/ AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r AMZN

Weakness Enumeration

CWE-ID CWE Name Source
CWE-191 Integer Underflow (Wrap or Wraparound) AMZN  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-7423
NVD Published Date:
04/29/2026
NVD Last Modified:
04/30/2026
Source:
AMZN