CVE-2026-87121criticalCWE-787

CVE-2026-87121: critical vulnerability in lwIP TCP/IP Stack MQTT

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

Published

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.3epss 0.8%
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.
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
Affected products
lwIP · TCP/IP Stack MQTT