{"id":"CVE-2021-33900","aliases":["EUVD-2021-1565","GHSA-4x25-f45x-grv5","UBUNTU-CVE-2021-33900"],"status":"published","title":"StartTLS and SASL confidentiality protection bypass","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00793,"percentile":0.56797,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-311","CWE-319"],"published":"2021-07-26T07:05:10Z","modified":"2026-10-24T10:30:20Z","fixes":[{"ecosystem":"Maven","package":"org.apache.directory.studio:org.apache.directory.studio.parent","fixed_in":["2.0.0.v20210717-M17"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.directory.studio:org.apache.directory.studio.parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.0.0.v20210213-M16"},{"fixed":"2.0.0.v20210717-M17"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.apache.directory.studio:org.apache.directory.studio.parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0.v20210717-M17"}]}],"versions":["2.0.0.v20150606-M9","2.0.0.v20151221-M10","2.0.0.v20161101-M12","2.0.0.v20170904-M13","2.0.0.v20180908-M14","2.0.0.v20200411-M15","2.0.0.v20210213-M16"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M15-1","2.0.0~M15-2","2.0.0~M15-3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M15-4","2.0.0~M24-2~18.04"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M24-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M24-4"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M26-1","2.0.0~M26-3","2.0.0~M26-4"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M26-5"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M26-5build1","2.0.0~M26-6","2.0.0~M26-7"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"apache-directory-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0~M26-5","2.0.0~M26-5build1"]}],"products":[{"vendor":"apache","product":"directory_studio"},{"vendor":"apache software foundation","product":"apache directory studio"}],"references":[{"url":"https://lists.apache.org/thread.html/rb1dbcc43a5b406e45d335343a1704f4233de613140a01929d102fdc9%40%3Cusers.directory.apache.org%3E","tags":["x_refsource_MISC","x_transferred","Mailing List","Vendor Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33900","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4x25-f45x-grv5"},{"url":"https://ubuntu.com/security/CVE-2021-33900","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/07/24/1","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33900","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-33900","title":"StartTLS and SASL confidentiality protection bypass","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-07-26T07:05:10Z","modified":"2024-08-04T00:05:51.036Z","cwes":["CWE-311"],"updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-1565","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-07-26T07:05:10Z","modified":"2024-08-04T00:05:51Z","updated_at":"2026-11-03T03:24:33.318275Z"}],"ghsa":[{"id":"GHSA-4x25-f45x-grv5","title":"Missing encryption in Apache Directory Studio","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-08-09T20:40:53Z","modified":"2023-01-29T05:07:50Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-311","CWE-319"],"updated_at":"2026-11-02T14:36:26.667347Z"}],"nvd":[{"id":"CVE-2021-33900","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-07-26T07:15:07.183Z","modified":"2026-06-17T03:55:21.18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-311","CWE-319"],"updated_at":"2026-11-02T14:06:56.185362Z"}],"osv":[{"id":"CVE-2021-33900","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-07-26T07:15:07.183Z","modified":"2026-10-24T10:30:20.528601689Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"GHSA-4x25-f45x-grv5","title":"Missing encryption in Apache Directory Studio","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-08-09T20:40:53Z","modified":"2023-11-08T04:06:06.534714Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-311","CWE-319"],"updated_at":"2026-11-02T15:46:37.528068Z"},{"id":"UBUNTU-CVE-2021-33900","description":"While investigating DIRSTUDIO-1219 it was noticed that configured StartTLS encryption was not applied when any SASL authentication mechanism (DIGEST-MD5, GSSAPI) was used. While investigating DIRSTUDIO-1220 it was noticed that any configured SASL confidentiality layer was not applied. This issue affects Apache Directory Studio version 2.0.0.v20210213-M16 and prior versions.","status":"published","published":"2021-07-26T07:15:00Z","modified":"2026-10-17T12:56:19.937669403Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:27.870979Z"}]}}