CVE-2020-7663
HIGH 7.5EPSS 4.6%
websocket-extensions ruby module prior to 0.1.5 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 (ruby)
- 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
- 4.64% chance of exploitation in the next 30 days, 92nd percentile
- Published
- 2020-06-02
- Updated
- 2024-08-04
Proof-of-concept exploits (1)
Security advisories
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
- faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
- faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
- https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html
- https://usn.ubuntu.com/4502-1
- advisories/GHSA-g6wq-qcwm-j5g2