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.
Advisories

No advisories yet.

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

Wed, 23 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
First Time appeared Lwip
Lwip tcp/ip Stack Mqtt
Vendors & Products Lwip
Lwip tcp/ip Stack Mqtt

Tue, 22 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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

Updated: 2026-09-22T20:23:05.983Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-09-23T19:42:48.540

Link: CVE-2026-87121

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T09:11:52Z

Weaknesses