CVE-2021-32640

Description

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.

How to fix CVE-2021-32640

To remediate CVE-2021-32640, upgrade the affected package to a fixed version below.

• —upgrade to 7.4.2+~cs18.0.8-2 or later
• —upgrade to 7.4.6 or later

Is CVE-2021-32640 being exploited?

Low — EPSS is 1.2%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 7.4.2+~cs18.0.8-2
• >= 7.0.0, < 7.4.6

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32640
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-32640
• PATCHgithub.com/websockets/ws
• WEBgithub.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff
• WEB