Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.

CVE-2021-32640 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff	CVE	PatchThird Party Advisory
https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693	CVE	ExploitMitigationPatchThird Party Advisory
https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E	CVE
https://security.netapp.com/advisory/ntap-20210706-0005/	CVE	Third Party Advisory
https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff	[email protected]	PatchThird Party Advisory
https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693	[email protected]	ExploitMitigationPatchThird Party Advisory
https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E	[email protected]
https://security.netapp.com/advisory/ntap-20210706-0005/	[email protected]	Third Party Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-400	Uncontrolled Resource Consumption	[email protected]
CWE-400	Uncontrolled Resource Consumption	[email protected]

Affected Products

Product	Versions
ws project ws	>= 5.0.0, < 6.2.2 >= 7.0.0, < 7.4.6
CPE cpe:2.3:a:ws_project:ws::::::node.js::* Remediation No remediation found in references.
netapp e-series performance analyzer	All versions
CPE cpe:2.3:a:netapp:e-series_performance_analyzer:-:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Jun 4, 2022	Modified Analysis	[email protected]
Jul 6, 2021	CVE Modified	[email protected]
Jul 1, 2021	CVE Modified	[email protected]
Jun 2, 2021	Initial Analysis	[email protected]