PT-2026-35974 · Unknown · Freertos-Plus-Tcp

Archigup · Published 2026-04-29 · Updated 2026-05-04 · CVE-2026-7423

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions FreeRTOS-Plus-TCP versions prior to V4.4.1 FreeRTOS-Plus-TCP versions prior to V4.2.6

Description An integer underflow exists in the ICMP and ICMPv6 echo reply handlers when outgoing ping support is enabled. This occurs because header sizes are subtracted from a packet length field without verifying if the field is sufficiently large, leading to a heap out-of-bounds read of approximately 65KB. An adjacent network user can exploit this to cause a denial of service, resulting in a device crash.

Recommendations Upgrade to version V4.4.1 or later. Upgrade to version V4.2.6 or later.

Fix

DoS

Integer Underflow

Weakness Enumeration

CWE-191

Related Identifiers

CVE-2026-7423

Affected Products

Freertos-Plus-Tcp

References · 8

• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-7423 · Security Note
• https://aws.amazon.com/security/security-bulletins/2026-021-aws · Vendor Advisory
• https://t.me/cveNotify/162021 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2049590782315671936 · Twitter Post
• https://twitter.com/CVEnew/status/2049578372553171342 · Twitter Post