{"id":"UBUNTU-CVE-2021-20185","details":"It was found in Moodle before version 3.10.1, 3.9.4, 3.8.7 and 3.5.16 that messaging did not impose a character limit when sending messages, which could result in client-side (browser) denial of service for users receiving very large messages.","modified":"2025-10-24T04:50:04Z","published":"2021-01-28T20:15:00Z","upstream":["CVE-2021-20185"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-20185"},{"type":"REPORT","url":"https://moodle.org/mod/forum/discuss.php?d=417168"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-20185"}],"affected":[{"package":{"name":"moodle","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/moodle@3.0.3+dfsg-0ubuntu1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.9+dfsg-1","2.7.10+dfsg-1","2.7.11+dfsg-1","2.7.11+dfsg-2","2.7.12+dfsg-1","3.0.3+dfsg-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"moodle","binary_version":"3.0.3+dfsg-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20185.json"}},{"package":{"name":"moodle","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/moodle@3.0.3+dfsg-0ubuntu1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.3+dfsg-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"moodle","binary_version":"3.0.3+dfsg-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20185.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}