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CVE-2026-7423

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorADJACENT_NETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/29/2026

Last Modified4/30/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-191

References

https://aws.amazon.com/security/security-bulletins/2026-021-aws/(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r(ff89ba41-3aa1-4d27-914a-91399e9639e5)

IOC Correlations

No correlations recorded

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