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CVE-2020-7662

7.5 · HIGH

websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking.

Published Jun 2, 2020EPSS 3.01%

Overview

CVE-2020-7662 is a high-severity vulnerability. It was published on June 2, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsGitHubgithub.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237GitHubgithub.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qvRefsnyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623Refblog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsGitHubgithub.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237GitHubgithub.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qvRefsnyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623

How CyberStrike helps

Frequently asked questions

What is CVE-2020-7662?

CVE-2020-7662 is a high-severity vulnerability. It was published on June 2, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-7662?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-7662?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-7662?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-7662 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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