Is CVE-2026-87121 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-87121?

CVE-2026-87121 has a CVSS v3 severity of CRITICAL (9.8).

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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.