lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.

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Advisories

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Fixes

Solution

Users of lwIP are encouraged to update their version of lwIP using the repository found at  https://savannah.nongnu.org/projects/lwip . The commit identifier that contains the fix is f89407ea711879c04d91c92b35d67be78bbaf0f1.


Workaround

No workaround given by the vendor.

History

Tue, 22 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
Description lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.
Title Out-of-bounds write in lwIP TCP/IP Stack MQTT Client Application
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-09-22T20:23:09.069Z

Reserved: 2026-09-09T21:28:27.099Z

Link: CVE-2026-87121

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-22T20:17:09.967

Modified: 2026-09-22T20:17:09.967

Link: CVE-2026-87121

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses