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CVE-2021-32640— ReDoS in Sec-Websocket-Protocol header

Quick assessment

Affected
websockets ws
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

github ws是一个应用软件。一种易于使用，运行迅速且经过全面测试的WebSocket客户端和服务器实现的方法。 ws 7.4.6之前版本存在安全漏洞，该漏洞源于“Sec-Websocket-Protocol”标头的一个特殊的值可以用来显著降低ws服务器的速度。

CVSS 5.3 · Medium EPSS 2.82% · P86

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-32640

Vulnerability Information
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Vulnerability Title
ReDoS in Sec-Websocket-Protocol header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
github ws 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
github ws是一个应用软件。一种易于使用，运行迅速且经过全面测试的WebSocket客户端和服务器实现的方法。 ws 7.4.6之前版本存在安全漏洞，该漏洞源于“Sec-Websocket-Protocol”标头的一个特殊的值可以用来显著降低ws服务器的速度。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
websockets ws >= 5.0.0 <= 7.4.5 -

II. Public POCs for CVE-2021-32640

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III. Intelligence Information for CVE-2021-32640

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Patches & Fixes for CVE-2021-32640 (1)

Vendor Advisories for CVE-2021-32640 (2)

Mailing List Discussions for CVE-2021-32640 (1)

IV. Related Vulnerabilities

Same product: ws
Same vendor: websockets
Same weakness: CWE-400

V. Comments for CVE-2021-32640

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