CVE-2025-11677— Use After Free in libwebsockets WebSocket server
Quick assessment
Affected
warmcat libwebsockets
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Libwebsockets是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在资源管理错误漏洞，该漏洞源于WebSocket服务器实现中存在释放后重用问题，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-11677
Vulnerability Information
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Vulnerability Title
Use After Free in libwebsockets WebSocket server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Libwebsockets 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Libwebsockets是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在资源管理错误漏洞，该漏洞源于WebSocket服务器实现中存在释放后重用问题，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| warmcat | libwebsockets | 3 ~ 4.4.1,4.3.6 | - |
|
II. Public POCs for CVE-2025-11677
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · warmcat · 2025-10-20 · 4 CVEs total
| CVE-2025-11679 | Out-of-bounds Read in libwebsockets PNG parsing | |
| CVE-2025-11678 | Stack-based Buffer Overflow in libwebsockets DNS response parsing | |
| CVE-2025-11680 | Out-of-bounds Write in libwebsockets PNG parsing |
IV. Related Vulnerabilities
Same product: libwebsockets
-
CVE-2026-78161
warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_ -
CVE-2026-10650
warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plai -
CVE-2025-11680
Out-of-bounds Write in libwebsockets PNG parsing -
CVE-2025-11679
Out-of-bounds Read in libwebsockets PNG parsing -
CVE-2025-1866
Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic i
Same vendor: warmcat
-
CVE-2026-78161
warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_ -
CVE-2026-10650
warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plai -
CVE-2025-11680
Out-of-bounds Write in libwebsockets PNG parsing -
CVE-2025-11679
Out-of-bounds Read in libwebsockets PNG parsing -
CVE-2025-11678
Stack-based Buffer Overflow in libwebsockets DNS response pa
Same weakness: CWE-416
V. Comments for CVE-2025-11677
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