{"id":"CVE-2021-33580","details":"User controlled `request.getHeader(\"Referer\")`, `request.getRequestURL()` and `request.getQueryString()` are used to build and run a regex expression. The attacker doesn't have to use a browser and may send a specially crafted Referer header programmatically. Since the attacker controls the string and the regex pattern he may cause a ReDoS by regex catastrophic backtracking on the server side. This problem has been fixed in Roller 6.0.2.","modified":"2026-07-08T21:27:10.668918Z","published":"2021-08-18T08:15:06.173Z","references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/08/18/1"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/roller","events":[{"introduced":"0"},{"fixed":"0f72a27a00271018448481aac321567a9e849d9b"}],"database_specific":{"cpe":"cpe:2.3:a:apache:roller:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"6.0.2"}],"source":"CPE_RANGE"}}],"versions":["roller-6.0.1","roller-6.0.0-rc-3","roller-6.0.0","roller-5.2.3-rc-3","roller-5.2.0-final","roller-5.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33580.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}