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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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"32640","Ordinal":"2","NoteData":"2021-05-25","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"32640","Ordinal":"3","NoteData":"2021-07-06","Type":"Other","Title":"Modified"}]}}}