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 [email protected] (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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

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

Updated: 2024-08-03T23:25:31.019Z

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

Link: CVE-2021-32640

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

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

Modified: 2024-11-21T06:07:26.223

Link: CVE-2021-32640

cve-icon Redhat

Severity : Low

Publid Date: 2021-05-25T00:00:00Z

Links: CVE-2021-32640 - Bugzilla