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.
Advisories

No advisories yet.

Fixes

Solution

Update the library to its latest stable release, if not possible backport the fix commit 2f082ec31261f556969160143ba94875d783971a


Workaround

No workaround given by the vendor.

History

Tue, 21 Oct 2025 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Low


Mon, 20 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 20 Oct 2025 14:00:00 +0000

Type Values Removed Values Added
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.
Title Use After Free in libwebsockets WebSocket server
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 6.3, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2025-10-20T13:54:19.569Z

Reserved: 2025-10-13T09:56:10.952Z

Link: CVE-2025-11677

cve-icon Vulnrichment

Updated: 2025-10-20T13:54:12.114Z

cve-icon NVD

Status : Received

Published: 2025-10-20T14:15:39.357

Modified: 2025-10-20T14:15:39.357

Link: CVE-2025-11677

cve-icon Redhat

Severity : Low

Publid Date: 2025-10-20T13:41:10Z

Links: CVE-2025-11677 - Bugzilla

cve-icon OpenCVE Enrichment

No data.