CVE-2021-33580: Apache Roller

High severity, CVSS 7.5. EPSS: 3.3% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Roller: before 6.0.2 (fixed in 6.0.2)

Published 2021-08-18. Last modified 2026-06-17.