{"schemaVersion":3,"id":"CVE-2020-15078","aliases":["ALPINE-CVE-2020-15078","MGASA-2021-0302","UBUNTU-CVE-2020-15078","DEBIAN-CVE-2020-15078"],"status":"published","duplicateOf":null,"title":null,"description":"OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control channel data on servers configured with deferred authentication, which can be used to potentially trigger further information leaks.","dates":{"published":"2021-04-26T13:19:45.000Z","modified":"2024-08-04T13:08:21.675Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.04908,"percentile":0.92022,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.04908},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.04908,"percentile":0.92022}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.04908,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.04908,"percentile":0.92022}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-305","name":"Authentication Bypass by Primary Weakness","description":"The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/305.html"},{"id":"CWE-306","name":"Missing Authentication for Critical Function","description":"The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/306.html"}],"affected":[{"vendor":"alpine","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/openvpn","purlType":"apk","versions":[{"text":"≥ 2.5.0, < 2.4.11-r0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.5.0, < 2.5.2-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.5.0, < 2.4.11-r0 | ≥ 2.5.0, < 2.5.2-r0","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null},{"vendor":"canonical","product":"ubuntu_linux","name":"ubuntu linux","label":"ubuntu_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"18.04","noFixRecorded":false,"fixedIn":null},{"text":"20.04","noFixRecorded":false,"fixedIn":null},{"text":"20.10","noFixRecorded":false,"fixedIn":null},{"text":"21.04","noFixRecorded":false,"fixedIn":null}],"versionsText":"18.04 | 20.04 | 20.10 | 21.04","eol":{"isEol":true,"eolDate":"2023-05-31T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"18.04","label":"18.04 'Bionic Beaver' (LTS)","eolFrom":"2023-05-31T00:00:00.000Z","isLts":true,"isMaintained":true,"latestVersion":"18.04.6"},"product":{"name":"ubuntu","label":"Ubuntu","category":"os"}},"hubHref":"/vendor/canonical/ubuntu_linux"},{"vendor":"debian","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/openvpn","purlType":"deb","versions":[{"text":"< 2.5.1-2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.5.1-2","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null},{"vendor":"ubuntu","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/openvpn","purlType":"deb","versions":[{"text":"< 2.4.4-2ubuntu1.5","noFixRecorded":false,"fixedIn":null},{"text":"< 2.4.7-1ubuntu2.20.04.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.4-2ubuntu1.5 | < 2.4.7-1ubuntu2.20.04.2","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.0","eol":{"isEol":true,"eolDate":"2022-07-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"9","label":"9 (Stretch)","eolFrom":"2022-07-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"9.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"fedoraproject","product":"fedora","name":"fedora","label":"fedora","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"32","noFixRecorded":false,"fixedIn":null},{"text":"33","noFixRecorded":false,"fixedIn":null},{"text":"34","noFixRecorded":false,"fixedIn":null}],"versionsText":"32 | 33 | 34","eol":{"isEol":true,"eolDate":"2021-05-25T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"32","label":"32","eolFrom":"2021-05-25T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"fedora","label":"Fedora Linux","category":"os"}},"hubHref":"/vendor/fedoraproject/fedora"},{"vendor":"mageia","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/openvpn","purlType":"rpm","versions":[{"text":"< 2.4.9-1.1.mga7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.9-1.1.mga7","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null},{"vendor":"mageia","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/openvpn","purlType":"rpm","versions":[{"text":"< 2.5.0-2.1.mga8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.5.0-2.1.mga8","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null},{"vendor":"openvpn","product":"openvpn","name":"OpenVPN","label":"openvpn","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.4.11","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.5.0, < 2.5.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.11 | ≥ 2.5.0, < 2.5.2","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":"/vendor/openvpn/openvpn"}],"affectedCount":9,"eol":{"hasEol":true,"count":3},"references":[{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GJUXEYHUPREEBPX23VPEKMFXUPVO3PMU/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLDB3OBQ3AODYYRN7NRCABV6I4AUFAT6/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://community.openvpn.net/openvpn/wiki/CVE-2020-15078","label":"community.openvpn.net/openvpn/wiki/CVE-2020-15078","hostname":"community.openvpn.net","tags":["X Refsource MISC","REPORT","Patch","Vendor Advisory"]},{"url":"https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements","label":"community.openvpn.net/openvpn/wiki/SecurityAnnouncements","hostname":"community.openvpn.net","tags":["X Refsource MISC","Broken Link"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGEGLC4YGBDN5CGHTNWN2GH6DJJA36T2/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://security.gentoo.org/glsa/202105-25","label":"security.gentoo.org/glsa/202105-25","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://usn.ubuntu.com/usn/usn-4933-1","label":"usn.ubuntu.com/usn/usn-4933-1","hostname":"usn.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html","label":"lists.debian.org/debian-lts-announce/2022/05/msg00002.html","hostname":"lists.debian.org","tags":["Mailing List","X Refsource MLIST","Third Party Advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-15078","label":"security.alpinelinux.org/vuln/CVE-2020-15078","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0302.html","label":"advisories.mageia.org/MGASA-2021-0302.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29007","label":"bugs.mageia.org/show_bug.cgi?id=29007","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4933-1","label":"ubuntu.com/security/notices/USN-4933-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/GJUXEYHUPREEBPX23VPEKMFXUPVO3PMU/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2020-15078","label":"ubuntu.com/security/CVE-2020-15078","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-15078","label":"www.cve.org/CVERecord?id=CVE-2020-15078","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-15078","label":"security-tracker.debian.org/tracker/CVE-2020-15078","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2992-1","OPENSUSE-SU-2021:0734-1","OPENSUSE-SU-2024:11128-1","SUSE-SU-2021:14723-1","SUSE-SU-2021:1576-1","SUSE-SU-2021:1577-1","USN-4933-1"],"duplicates":[],"related":["OPENSUSE-SU-2021:0734-1","OPENSUSE-SU-2024:11128-1","SUSE-SU-2021:14723-1","SUSE-SU-2021:1576-1","SUSE-SU-2021:1577-1","USN-4933-1"]},"timeline":[{"kind":"published","date":"2021-04-26T13:19:45.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T13:08:21.675Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T10:36:13.515Z","stale":false,"partial":false}}