CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2021-32640
Medium (5.3). EPSS 2.8% chance of exploitation in the next 30 days. Fixed in ws 5.2.3, 6.2.2, 7.4.6.
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.
Severity
- EPSS
- 2.8% chance of exploitation in the next 30 days; higher than 86% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netapp:e-series_performance_analyzer
- ws_project:ws
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-6fc8-4gx4-v693 | npm | ws | >=7.0.0 <7.4.6 | 7.4.6 |
| GHSA-6fc8-4gx4-v693 | npm | ws | >=6.0.0 <6.2.2 | 6.2.2 |
| GHSA-6fc8-4gx4-v693 | npm | ws | >=5.0.0 <5.2.3 | 5.2.3 |
References
- https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff
- https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
- https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E
- https://security.netapp.com/advisory/ntap-20210706-0005/
- https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff