CVE-2025-11677
libwebsockets - security update
EPSS 0.07%
Description
Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.
How to fix CVE-2025-11677
To remediate CVE-2025-11677, upgrade the affected package to a fixed version below.
- Debian/libwebsockets—upgrade to 4.0.20-2+deb11u1 or later
- Debian/libwebsockets—upgrade to 4.0.20-2+deb11u1 or later
Is CVE-2025-11677 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.0.20-2+deb11u1
- from 0, < 4.0.20-2+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |