{"id":"CVE-2020-35509","aliases":["EUVD-2022-6620","GHSA-rpj2-w6fr-79hc","RHSA-2021:3527","RHSA-2021:3528","RHSA-2021:3529"],"status":"published","title":"Keycloak vulnerable to Improper Certificate Validation","description":"A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00362,"percentile":0.30346,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-295"],"published":"2022-08-23T15:53:02Z","modified":"2026-10-24T10:30:28Z","fixes":[{"ecosystem":"Maven","package":"org.keycloak:keycloak-core","fixed_in":["14.0.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.keycloak:keycloak-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"14.0.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.keycloak:keycloak-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"14.0.0"}]}],"versions":["1.0-alpha-1","1.0-alpha-1-12062013","1.0-alpha-2","1.0-alpha-3","1.0-alpha-4","1.0-beta-1","1.0-beta-1-20150521","1.0-beta-1-20150523","1.0-beta-2","1.0-beta-3","1.0-beta-4","1.0-final","1.0-rc-1","1.0-rc-2","1.0.1.Final","1.0.2.Final","1.0.3.Final","1.0.4.Final","1.0.5.Final","1.1.0.Beta1","1.1.0.Beta2","1.1.0.Final","1.1.1.Final","1.2.0.Beta1","1.2.0.CR1","1.2.0.Final","1.3.0.Final","1.3.1.Final","1.4.0.Final","1.5.0-Final","1.5.0.Final","1.5.1.Final","1.6.0.Final","1.6.1.Final","1.7.0.CR1","1.7.0.Final","1.8.0.Alpha1","1.8.0.CR1","1.8.0.CR2","1.8.0.CR3","1.8.0.Final","1.8.1.Final","1.9.0.CR1","1.9.0.Final","1.9.1.Final","1.9.2.Final","1.9.3.Final","1.9.4.Final","1.9.5.Final","1.9.7.Final","1.9.8.Final","10.0.0","10.0.1","10.0.2","11.0.0","11.0.1","11.0.2","11.0.3","12.0.0","12.0.1","12.0.2","12.0.3","12.0.4","13.0.0","13.0.1","2.0.0.CR1","2.0.0.Final","2.1.0.CR1","2.1.0.Final","2.2.0.CR1","2.2.0.Final","2.2.1.Final","2.3.0.CR1","2.3.0.Final","2.4.0.CR1","2.4.0.Final","2.5.0.CR1","2.5.0.Final","2.5.1.Final","2.5.4.Final","2.5.5.Final","3.0.0.CR1","3.0.0.Final","3.1.0.CR1","3.1.0.Final","3.2.0.CR1","3.2.0.Final","3.2.1.Final","3.3.0.CR1","3.3.0.CR2","3.3.0.Final","3.4.0.CR1","3.4.0.Final","3.4.1.CR1","3.4.1.Final","3.4.2.Final","3.4.3.Final","4.0.0.Beta1","4.0.0.Beta2","4.0.0.Beta3","4.0.0.Final","4.1.0.Final","4.2.0.Final","4.2.1.Final","4.3.0.Final","4.4.0.Final","4.5.0.Final","4.6.0.Final","4.7.0.Final","4.8.0.Final","4.8.1.Final","4.8.2.Final","4.8.3.Final","5.0.0","6.0.0","6.0.1","7.0.0","7.0.1","8.0.0","8.0.1","8.0.2","9.0.0","9.0.2","9.0.3"]},{"source":"osv","ecosystem":"Red Hat:red_hat_single_sign_on:7::el6","package":"rh-sso7-keycloak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.0.15-1.redhat_00002.1.el6sso"}]}],"bundled":5},{"source":"osv","ecosystem":"Red Hat:red_hat_single_sign_on:7::el6","package":"rh-sso7-keycloak-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.0.15-1.redhat_00002.1.el6sso"}]}],"bundled":5},{"source":"osv","ecosystem":"Red Hat:red_hat_single_sign_on:7::el7","package":"rh-sso7-keycloak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.0.15-1.redhat_00002.1.el7sso"}]}],"bundled":5},{"source":"osv","ecosystem":"Red Hat:red_hat_single_sign_on:7::el7","package":"rh-sso7-keycloak-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.0.15-1.redhat_00002.1.el7sso"}]}],"bundled":5},{"source":"osv","ecosystem":"Red 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Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-35509","tags":["advisory"]},{"url":"https://github.com/keycloak/keycloak/pull/6330","tags":["web"]},{"url":"https://github.com/keycloak/keycloak/pull/8067","tags":["web"]},{"url":"https://github.com/keycloak/keycloak/commit/478319348bdfdb9b6d39122f41edf2af79f679bb","tags":["web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1912427","tags":["web","report"]},{"url":"https://github.com/keycloak/keycloak/blob/4f330f4a57cbfcf6202b60546518261c66e59a35/services/src/main/java/org/keycloak/authentication/authenticators/x509/ValidateX509CertificateUsername.java#L74-L76","tags":["web"]},{"url":"https://github.com/advisories/GHSA-rpj2-w6fr-79hc"},{"url":"https://github.com/keycloak/keycloak","tags":["package"]},{"url":"https://access.redhat.com/errata/RHSA-2021:3527","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.4/html/release_notes/index","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1930423","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1953439","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1978196","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1979638","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3527.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-28491","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-28491","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28491","tags":["advisory"]},{"url":"https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONDATAFORMAT-1047329","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-35509","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-35509","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3513","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3513","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3513","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3632","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3632","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3632","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-3637","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3637","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3637","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:3528","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3528.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:3529","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3529.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-35509","description":"A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.","status":"published","published":"2022-08-23T15:53:02Z","modified":"2025-06-30T20:17:24.662Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:35:57.975444Z"}],"euvd":[{"id":"EUVD-2022-6620","description":"A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.","status":"published","published":"2022-08-23T15:53:02Z","modified":"2025-06-30T20:17:24Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:15.30157Z"}],"ghsa":[{"id":"GHSA-rpj2-w6fr-79hc","title":"Keycloak vulnerable to Improper Certificate Validation","description":"keycloak accepts an expired certificate by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.\n\nThis issue was partially fixed in version [13.0.1](https://github.com/keycloak/keycloak/pull/6330) and more completely fixed in version [14.0.0](https://github.com/keycloak/keycloak/pull/8067).","status":"published","published":"2022-08-24T00:00:29Z","modified":"2025-06-30T21:46:08Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20","CWE-295"],"updated_at":"2026-11-02T14:38:48.783737Z"}],"nvd":[{"id":"CVE-2020-35509","description":"A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.","status":"published","published":"2022-08-23T16:15:08.95Z","modified":"2026-06-17T03:13:50.247Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-20","CWE-295"],"updated_at":"2026-11-02T14:06:46.951463Z"}],"osv":[{"id":"CVE-2020-35509","description":"A flaw was found in keycloak affecting versions 11.0.3 and 12.0.0. An expired certificate would be accepted by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.","status":"published","published":"2022-08-23T16:15:08.95Z","modified":"2026-10-24T10:30:28.296669578Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:16.612899Z"},{"id":"GHSA-rpj2-w6fr-79hc","title":"Keycloak vulnerable to Improper Certificate Validation","description":"keycloak accepts an expired certificate by the direct-grant authenticator because of missing time stamp validations. The highest threat from this vulnerability is to data confidentiality and integrity.\n\nThis issue was partially fixed in version [13.0.1](https://github.com/keycloak/keycloak/pull/6330) and more completely fixed in version [14.0.0](https://github.com/keycloak/keycloak/pull/8067).","status":"published","published":"2022-08-24T00:00:29Z","modified":"2025-06-30T22:12:17.735956Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20","CWE-295"],"updated_at":"2026-11-02T15:46:56.281047Z"},{"id":"RHSA-2021:3527","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 6","status":"published","published":"2024-09-29T18:12:03Z","modified":"2026-08-14T10:01:43Z","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":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:3528","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 7","status":"published","published":"2024-09-29T18:12:19Z","modified":"2026-08-14T10:01:43Z","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":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:3529","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 8","status":"published","published":"2024-09-29T18:12:26Z","modified":"2026-08-14T10:01:44Z","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":"2026-11-02T15:53:08.619234Z"}]}}