{"id":"CVE-2021-36093","aliases":["EUVD-2021-22725","GHSA-p8h5-xqwr-ww86","UBUNTU-CVE-2021-36093"],"status":"published","title":"DoS attack using PostMaster filters","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01108,"percentile":0.66135,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-185"],"published":"2021-09-06T13:15:24Z","modified":"2026-06-17T03:58:22Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"otrs2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.10-1","5.0.1-1","5.0.1-2","5.0.2-1","5.0.3-1","5.0.5-1","5.0.6-1","5.0.7-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"otrs2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.23-1","5.0.24-1","6.0.1-1","6.0.2-1","6.0.3-1","6.0.4-1","6.0.5-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"otrs2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.20-1","6.0.23-2","6.0.24-1","6.0.25-1","6.0.25-2","6.0.25-3","6.0.26-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"otrs2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.32-6","6.1.2-1","6.2.1-1","6.2.2-2"]}],"products":[{"vendor":"otrs","product":"otrs"},{"vendor":"otrs ag","product":"((otrs)) community edition"},{"vendor":"otrs ag","product":"otrs"}],"references":[{"url":"https://otrs.com/release-notes/otrs-security-advisory-2021-16/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36093"},{"url":"https://github.com/advisories/GHSA-p8h5-xqwr-ww86"},{"url":"https://ubuntu.com/security/CVE-2021-36093","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-36093","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-36093","title":"DoS attack using PostMaster filters","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","status":"published","published":"2021-09-06T13:15:24.049Z","modified":"2024-09-16T20:36:38.524Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-185"],"updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-22725","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","status":"published","published":"2021-09-06T13:15:24Z","modified":"2024-09-16T20:36:38Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:12.625541Z"}],"ghsa":[{"id":"GHSA-p8h5-xqwr-ww86","title":"It's possible to create an email which can be stuck while being processed by PostMaster filters,...","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","status":"published","published":"2022-05-24T19:13:03Z","modified":"2023-01-30T05:01:55Z","updated_at":"2026-11-02T14:46:30.744651Z"}],"nvd":[{"id":"CVE-2021-36093","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","status":"published","published":"2021-09-06T14:15:07.197Z","modified":"2026-06-17T03:58:22.02Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-185"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"UBUNTU-CVE-2021-36093","description":"It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.","status":"published","published":"2021-09-06T14:15:00Z","modified":"2025-10-24T04:50:26Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:54:27.870979Z"}]}}