CVE-2025-11677
Unknown
Unknown - Not Provided
BaseFortify
Publication date: 2025-10-20
Last updated on: 2025-10-21
Assigner: Nozomi Networks Inc.
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| warmcat | libwebsockets | 4.4.1 |
| warmcat | libwebsockets | 3.0 |
| warmcat | libwebsockets | 4.3.6 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a Use After Free issue in the WebSocket server implementation within the lws_handshake_server function of the warmcat libwebsockets library. It may allow an attacker, under specific configurations where a user provides a callback function handling LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to cause a denial of service.
How can this vulnerability impact me? :
The vulnerability can lead to a denial of service condition, potentially disrupting the availability of services that use the affected WebSocket server implementation.
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