CriticalCritical vulnerability
CVE-2026-87121 (CVSS 9.3)
NVD · officialPublished Sep 22, 2026Risk 50/100EPSS 0.5%
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.
Technical details
CVSS
9.3
AV:NetworkAC:LowPR:NoneUI:None
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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