CVE-2026-7423

medium

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.

References

https://aws.amazon.com/security/security-bulletins/2026-021-aws/

https://aws.amazon.com/security/security-bulletins/rss/2026-021-aws/

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6

Details

Source: Mitre, NVD

Published: 2026-04-29

Updated: 2026-04-30

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:A/AC:H/Au:N/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.3

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

Severity: Medium

CVSS v4

Base Score: 6

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

Severity: Medium

EPSS

EPSS: 0.00015