{"id":"UBUNTU-CVE-2021-21439","details":"DoS attack can be performed when an email contains specially designed URL in the body. It can lead to the high CPU usage and cause low quality of service, or in extreme case bring the system to a halt. 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 7.0.26 and prior versions; 8.0.x version 8.0.13 and prior versions.","modified":"2025-10-24T04:50:07Z","published":"2021-06-14T08:15:00Z","upstream":["CVE-2021-21439"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-21439"},{"type":"REPORT","url":"https://otrs.com/release-notes/otrs-security-advisory-2021-09/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-21439"}],"affected":[{"package":{"name":"otrs2","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/otrs2@5.0.7-1?arch=source&distro=xenial"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"otrs","binary_version":"5.0.7-1"},{"binary_name":"otrs2","binary_version":"5.0.7-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21439.json"}},{"package":{"name":"otrs2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/otrs2@6.0.5-1?arch=source&distro=bionic"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"otrs","binary_version":"6.0.5-1"},{"binary_name":"otrs2","binary_version":"6.0.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21439.json"}},{"package":{"name":"otrs2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/otrs2@6.0.26-1?arch=source&distro=focal"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"otrs","binary_version":"6.0.26-1"},{"binary_name":"otrs2","binary_version":"6.0.26-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21439.json"}},{"package":{"name":"otrs2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/otrs2@6.2.2-2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.32-6","6.1.2-1","6.2.1-1","6.2.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"otrs2","binary_version":"6.2.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21439.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}