Is CVE-2025-11677 in the CISA KEV catalog?

No. CVE-2025-11677 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2025-11677?

CVE-2025-11677 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-11677?

Upgrade libwebsockets on debian 11 to 4.0.20-2+deb11u1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2025-11677

UNSCORED

NVD

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.

CWE-416Use After Free

How to fix

Remediation Available

libwebsocketsDebian

Fixed in:4.0.20-2+deb11u1CVE-2025-11677

Fixed in:4.3.5-1+deb13u1CVE-2025-11677

Fixed in:4.3.5-3CVE-2025-11677

libwebsocketsUbuntu

Fixed in:3.2.1-3ubuntu0.1~esm1USN-8024-1

Fixed in:4.0.20-2ubuntu1.1USN-8024-1

Fixed in:4.3.3-1.1ubuntu0.1~esm1USN-8024-1

libwebsockets15Ubuntu

Fixed in:3.2.1-3ubuntu0.1~esm1USN-8024-1

libwebsockets16Ubuntu

Fixed in:4.0.20-2ubuntu1.1USN-8024-1

libwebsockets19t64Ubuntu

Fixed in:4.3.3-1.1ubuntu0.1~esm1USN-8024-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-21.