CVE-2025-11677
Use After Free in libwebsockets WebSocket server
Severity Score
6.3
*CVSS v4
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
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.
*Credits:
Raffaele Bova at Nozomi Networks
CVSS Scores
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
System
Vulnerable | Subsequent
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2025-10-13 CVE Reserved
- 2025-10-20 CVE Published
- 2025-10-20 CVE Updated
- ---------- EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-416: Use After Free
CAPEC
- CAPEC-100: Overflow Buffers
References (2)
| URL | Tag | Source |
|---|---|---|
| https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677 | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a | 2025-10-20 |
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Warmcat Search vendor "Warmcat" | Libwebsockets Search vendor "Warmcat" for product "Libwebsockets" | >= 4.0.0 <= 4.4.2 Search vendor "Warmcat" for product "Libwebsockets" and version " >= 4.0.0 <= 4.4.2" | en |
Affected
| ||||||
| Warmcat Search vendor "Warmcat" | Libwebsockets Search vendor "Warmcat" for product "Libwebsockets" | >= 4.0.0 <= 4.3.6 Search vendor "Warmcat" for product "Libwebsockets" and version " >= 4.0.0 <= 4.3.6" | en |
Affected
| ||||||