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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 04 May 2026 13:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*

Thu, 30 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Amazon
Amazon freertos-plus-tcp
Vendors & Products Amazon
Amazon freertos-plus-tcp

Wed, 29 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 29 Apr 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-04-29T19:08:11.602Z

Reserved: 2026-04-29T14:27:49.474Z

Link: CVE-2026-7423

cve-icon Vulnrichment

Updated: 2026-04-29T19:08:07.142Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-29T19:16:26.617

Modified: 2026-05-04T13:35:00.500

Link: CVE-2026-7423

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-30T08:15:31Z

Weaknesses