{"id":"CVE-2020-27813","aliases":["GHSA-3xh2-74w9-5vxm","GHSA-jf24-p9p9-4rjh","GO-2020-0019"],"url":"https://o3.security/vulnerability/CVE-2020-27813","summary":"Integer overflow in github.com/gorilla/websocket","details":"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.","published":"2020-12-02T01:15:12.780Z","modified":"2026-07-08T05:59:45.707104743Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.02146,"percentile":0.80534,"asOf":"2026-08-28"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/gorilla/websocket","fixedVersion":"1.4.1"}],"fix":{"url":"https://github.com/gorilla/websocket/pull/537","label":"gorilla/websocket#537"},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00012.html"},{"type":"ADVISORY","url":"https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/01/msg00008.html"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1902111"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27813"},{"type":"WEB","url":"https://github.com/gorilla/websocket/pull/537"},{"type":"WEB","url":"https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37"},{"type":"PACKAGE","url":"https://github.com/gorilla/websocket"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2020-0019"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:59:45.707104743Z"}}