CVE-2020-7662
HIGH 7.5EPSS 3.1%
websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.
- Affected
- websocket-extensions (npm)
- CVSS v3.1 NVD
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS v3.1 GitHub
- 8.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H - CVSS v2.0 NVD
- 5.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P - EPSS
- 3.09% chance of exploitation in the next 30 days, 88th percentile
- Published
- 2020-06-02
- Updated
- 2024-08-04
Proof-of-concept exploits (2)
- https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
- ossf-cve-benchmark/CVE-2020-76620★ · 2020-12-01
Security advisories
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
- faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
- faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
- advisories/GHSA-g78m-2chm-r7qv