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

5.3MEDIUM

Key Information:

Vendor

Websockets

Status
Ws
Vendor
CVE Published:
25 May 2021

What is CVE-2021-32640?

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 and/or the maxHeaderSize options.

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Affected Version(s)

ws >= 5.0.0 <= 7.4.5

References

https://github.com/websockets/ws/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/websockets/ws/commit/00c425ec77993773d...
x_refsource_MISC
https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31...
mailing-listx_refsource_MLIST

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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