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 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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

References

• https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
• https://nvd.nist.gov/vuln/detail/CVE-2021-32640
• https://github.com/websockets/ws/issues/1895
• https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff
• https://github.com/websockets/ws
• https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30@%3Ccommits.tinkerpop.apache.org%3E
• https://security.netapp.com/advisory/ntap-20210706-0005
• https://security-tracker.debian.org/tracker/CVE-2021-32640

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