CVE-2021-33580: vulnerability in Apache Roller
regex injection leading to DoS
Published · Updated
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3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 3.3%
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 Software Foundation · Apache RollerRelated CVEs — Apache Roller
In the same product, most dangerous first.
CVE-2018-17198—CVE-2018-17198EPSS 4.1%CVE-2023-37581—Apache Roller: Roller's weblog category, weblog settings and file-upload features did not properly sanitize input could be exploited to perform Reflected Cross Site Scripting (XSS) even on a Roller site configured for untrusted users.EPSS 1.2%CVE-2025-24859LOWApache Roller: Insufficient Session Expiration on Password ChangeEPSS 1.1%CVE-2026-82384CRITICALApache Roller: Unauthenticated deserialization in the XML-RPC endpointEPSS 1.0%CVE-2024-25090MEDIUMApache Roller: Insufficient input validation for some user profile and bookmark fields when Roller in untested-users modeEPSS 0.8%CVE-2026-82383HIGHApache Roller: Anonymous setup action allows frontpage configuration tamperingEPSS 0.5%