CVE-2026-7423

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-7423
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.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.6 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://aws.amazon.com/security/security-bulletins/2026-021-aws/ Vendor Advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 Release Notes
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 Release Notes
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r Patch Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*
cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*
History

17 Jun 2026, 11:02

Type Values Removed Values Added
References () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r - Vendor Advisory, Patch () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r - Patch, Vendor Advisory

04 May 2026, 13:35

Type Values Removed Values Added
First Time Amazon freertos-plus-tcp
Amazon
CPE cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*
References () https://aws.amazon.com/security/security-bulletins/2026-021-aws/ - () https://aws.amazon.com/security/security-bulletins/2026-021-aws/ - Vendor Advisory
References () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 - () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 - Release Notes
References () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 - () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 - Release Notes
References () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r - () https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r - Vendor Advisory, Patch

30 Apr 2026, 15:13

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-29 19:16

Updated : 2026-06-17 11:02

NVD link : CVE-2026-7423

Mitre link : CVE-2026-7423

CVE.ORG link : CVE-2026-7423

JSON object : View

Products Affected

amazon

  • freertos-plus-tcp
CWE
CWE-191

Integer Underflow (Wrap or Wraparound)