ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.
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cve-icon MITRE Information

Status: PUBLISHED

Assigner: GitHub_M

Published: 2021-05-25T18:25:09

Updated: 2021-07-06T07:06:26

Reserved: 2021-05-12T00:00:00


Link: CVE-2021-32640

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2021-05-25T19:15:07.767

Modified: 2023-11-07T03:35:20.380


Link: CVE-2021-32640

JSON object: View

cve-icon Redhat Information

No data.

CWE