CVE-2026-87121

EUVD-2026-84816
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 55.95%
Debian logo
Debian Releases
Debian Product
Codename
lwip
bookworm
unimportant
forky
2.2.1+dfsg1-9
fixed
sid
2.2.1+dfsg1-9
fixed
trixie
unimportant
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
lwip
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
stonking
needs-triage
Common Weakness Enumeration
References
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-265-01.json
https://savannah.nongnu.org/projects/lwip
https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-01