CVE-2026-87121 | BDVDB-2026-377883 Detail

lwIPTCP/IP Stack MQTT

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.

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

No public exploit known

9.8 Critical

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 56.0.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Memory Corruption

No specific action is recorded in the source data. Check the references for vendor guidance.

9.3 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).