What’s Vulnerable › Vulnerabilities

CVE-2020-27813

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-02 · updated 2026-06-17
• Weakness: CWE-190

Description

An integer overflow vulnerability exists with the length of websocket frames received via a websocket connection. An attacker would use this flaw to cause a denial of service attack on an HTTP Server allowing websocket connections.

Affected products

• Debian Linux: 9.0
• Gorillatoolkit Websocket: before 1.4.1 — fixed in 1.4.1

How to fix

Upgrade to a fixed version: Gorillatoolkit Websocket 1.4.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1902111
• https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh
• https://lists.debian.org/debian-lts-announce/2021/01/msg00008.html
• https://lists.debian.org/debian-lts-announce/2023/05/msg00012.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1902111
• https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh
• https://lists.debian.org/debian-lts-announce/2021/01/msg00008.html
• https://lists.debian.org/debian-lts-announce/2023/05/msg00012.html

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