{"api_version":"1","generated_at":"2026-07-23T15:43:56+00:00","cve":"CVE-2021-33580","urls":{"html":"https://cve.report/CVE-2021-33580","api":"https://cve.report/api/cve/CVE-2021-33580.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-33580","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33580"},"summary":{"title":"CVE-2021-33580","description":"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.","state":"PUBLIC","assigner":"security@apache.org","published_at":"2021-08-18 08:15:00","updated_at":"2021-08-26 01:25:00"},"problem_types":["CWE-400"],"metrics":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/08/18/1","name":"[oss-security] 20210817 CVE-2021-33580: Apache Roller: regex injection leading to DoS","refsource":"MLIST","tags":[],"title":"oss-security - CVE-2021-33580: Apache Roller: regex injection leading to DoS","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E","name":"https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E","refsource":"MISC","tags":[],"title":"Pony Mail!","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33580","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33580","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"Apache Roller would like to thank Ed Ra (https://github.com/edvraa) for reporting this.","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"33580","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"apache","cpe5":"roller","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@apache.org","ID":"CVE-2021-33580","STATE":"PUBLIC","TITLE":"regex injection leading to DoS"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Apache Roller","version":{"version_data":[{"version_affected":"<","version_name":"Apache Roller","version_value":"6.0.2"}]}}]},"vendor_name":"Apache Software Foundation"}]}},"credit":[{"lang":"eng","value":"Apache Roller would like to thank Ed Ra (https://github.com/edvraa) for reporting this."}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":[{"other":"Low: This attack will only work if Banned-words Referrer processing is turned on in Roller and it is off-by-default."}],"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-400 Uncontrolled Resource Consumption"}]}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E","name":"https://lists.apache.org/thread.html/r9d967d80af941717573e531db2c7353a90bfd0886e9b5d5d79f75506%40%3Cuser.roller.apache.org%3E"},{"refsource":"MLIST","name":"[oss-security] 20210817 CVE-2021-33580: Apache Roller: regex injection leading to DoS","url":"http://www.openwall.com/lists/oss-security/2021/08/18/1"}]},"source":{"discovery":"UNKNOWN"},"work_around":[{"lang":"eng","value":"This problem has been fixed in Roller 6.0.2. If you are not able to upgrade then you can \"work around\" the problem.\n\nIf Banned-Words Referrer processing is enabled and you are concerned about this type of attack then disable it.\n\nIn the Roller properties, set this property site.bannedwordslist.enable.referrers=false"}]},"nvd":{"publishedDate":"2021-08-18 08:15:00","lastModifiedDate":"2021-08-26 01:25:00","problem_types":["CWE-400"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:apache:roller:*:*:*:*:*:*:*:*","versionEndExcluding":"6.0.2","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"33580","Ordinal":"208990","Title":"CVE-2021-33580","CVE":"CVE-2021-33580","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"33580","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"33580","Ordinal":"2","NoteData":"2021-08-18","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"33580","Ordinal":"3","NoteData":"2021-08-18","Type":"Other","Title":"Modified"}]}}}