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Out-of-bounds write in lwIP TCP/IP Stack MQTT Client Application

CVSS 3.1 9.8 CRITICALCVSS 4.0 9.3 CRITICALCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-87121

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87121

Published

TCP/IP Stack MQTT

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "lwIP",
                    "product": "TCP/IP Stack MQTT",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2.0.1",
                            "lessThanOrEqual": "2.2.1",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 12 Nov 22:49 UTC · 273 of 275 readable · 271 fully read · documentation 469/469 current