{"id":"CVE-2020-20813","aliases":["EUVD-2020-13593","GHSA-6mpq-5wjj-48jg","UBUNTU-CVE-2020-20813"],"status":"published","title":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service...","description":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00919,"percentile":0.60554,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2023-08-22T00:00:00Z","modified":"2026-10-24T10:30:32Z","affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-4ubuntu1","2.3.2-5ubuntu1","2.3.2-7ubuntu1","2.3.2-7ubuntu2","2.3.2-7ubuntu3","2.3.2-7ubuntu3.1","2.3.2-7ubuntu3.2","2.3.2-7ubuntu3.2+esm1","2.3.2-7ubuntu3.2+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.7-1ubuntu1","2.3.7-2ubuntu1","2.3.8-1ubuntu1","2.3.10-1ubuntu1","2.3.10-1ubuntu2","2.3.10-1ubuntu2.1","2.3.10-1ubuntu2.2","2.3.10-1ubuntu2.2+esm1","2.3.10-1ubuntu2.2+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3-4ubuntu1","2.4.4-1ubuntu1","2.4.4-2ubuntu1","2.4.4-2ubuntu1.1","2.4.4-2ubuntu1.2","2.4.4-2ubuntu1.3","2.4.4-2ubuntu1.5","2.4.4-2ubuntu1.6","2.4.4-2ubuntu1.7","2.4.4-2ubuntu1.7+esm1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.7-1ubuntu2","2.4.7-1ubuntu2.20.04.2","2.4.7-1ubuntu2.20.04.3","2.4.7-1ubuntu2.20.04.4","2.4.12-0ubuntu0.20.04.1","2.4.12-0ubuntu0.20.04.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-3ubuntu1","2.5.1-3ubuntu2","2.5.1-3ubuntu4","2.5.1-3ubuntu5","2.5.5-1ubuntu1","2.5.5-1ubuntu3","2.5.5-1ubuntu3.1","2.5.9-0ubuntu0.22.04.2","2.5.9-0ubuntu0.22.04.3","2.5.11-0ubuntu0.22.04.1","2.5.11-0ubuntu0.22.04.3","2.5.11-0ubuntu0.22.04.4","2.5.11-0ubuntu0.22.04.5","2.5.11-0ubuntu0.22.04.6"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"openvpn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.5-0ubuntu1","2.6.7-1ubuntu1","2.6.9-1ubuntu2","2.6.9-1ubuntu3","2.6.9-1ubuntu4","2.6.9-1ubuntu4.1","2.6.12-0ubuntu0.24.04.1","2.6.12-0ubuntu0.24.04.3","2.6.14-0ubuntu0.24.04.1","2.6.14-0ubuntu0.24.04.2","2.6.14-0ubuntu0.24.04.3","2.6.19-0ubuntu0.24.04.1","2.6.19-0ubuntu0.24.04.2","2.6.19-0ubuntu0.24.04.3","2.6.19-0ubuntu0.24.04.4","2.6.19-0ubuntu0.24.04.5"]}],"products":[{"vendor":"openvpn","product":"openvpn"}],"references":[{"url":"https://www.freebuf.com/vuls/215171.html","tags":["x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-20813"},{"url":"https://github.com/advisories/GHSA-6mpq-5wjj-48jg"},{"url":"https://ubuntu.com/security/CVE-2020-20813","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-20813","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-20813","description":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.","status":"published","published":"2023-08-22T00:00:00Z","modified":"2024-10-04T16:22:07.912Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:45.763329Z"}],"euvd":[{"id":"EUVD-2020-13593","description":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.","status":"published","published":"2023-08-22T00:00:00Z","modified":"2024-10-04T16:22:07Z","updated_at":"2026-11-03T00:27:51.858084Z"}],"ghsa":[{"id":"GHSA-6mpq-5wjj-48jg","title":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service...","description":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.","status":"published","published":"2023-08-22T21:30:25Z","modified":"2024-10-07T21:33:28Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:58:25.780996Z"}],"nvd":[{"id":"CVE-2020-20813","description":"Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset 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packet.","status":"published","published":"2023-08-22T19:16:00Z","modified":"2026-10-22T23:16:19.594465864Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:23.905183Z"}]}}