{"api_version":"1","generated_at":"2026-04-17T07:46:12+00:00","cve":"CVE-2021-41773","urls":{"html":"https://cve.report/CVE-2021-41773","api":"https://cve.report/api/cve/CVE-2021-41773.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-41773","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-41773"},"summary":{"title":"CVE-2021-41773","description":"A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \"require all denied\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.","state":"PUBLIC","assigner":"security@apache.org","published_at":"2021-10-05 09:15:00","updated_at":"2023-11-07 03:39:00"},"problem_types":["CWE-22"],"metrics":[],"references":[{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/","name":"FEDORA-2021-2a10bc68a4","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 34 Update: httpd-2.4.51-1.fc34 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.gentoo.org/glsa/202208-20","name":"GLSA-202208-20","refsource":"GENTOO","tags":[],"title":"Apache HTTPD: Multiple Vulnerabilities (GLSA 202208-20) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://www.openwall.com/lists/oss-security/2021/10/08/3","name":"[oss-security] 20211008 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","refsource":"MLIST","tags":[],"title":"oss-security - 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The original patch issued under this CVE ID is insufficient, please review remediation information under CVE-2021-42013.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-41773","cwes":"CWE-22","catalogVersion":"2026.04.16","updated_at":"2026-04-16 13:54:09"},"epss":{"cve_year":"2021","cve_id":"41773","cve":"CVE-2021-41773","epss":"0.943910000","percentile":"0.999730000","score_date":"2026-04-16","updated_at":"2026-04-17 00:09:26"},"legacy_qids":[{"cve":"CVE-2021-41773","qid":"150372","title":"Apache HTTP Server Path Traversal (CVE-2021-41773)"},{"cve":"CVE-2021-41773","qid":"150373","title":"Apache HTTP Server Remote Code Execution (CVE-2021-41773)"},{"cve":"CVE-2021-41773","qid":"182596","title":"Debian Security Update for apache2 (CVE-2021-41773)"},{"cve":"CVE-2021-41773","qid":"281975","title":"Fedora Security Update for httpd (FEDORA-2021-2a10bc68a4)"},{"cve":"CVE-2021-41773","qid":"352857","title":"Amazon Linux Security Advisory for httpd24: ALAS-2021-1543"},{"cve":"CVE-2021-41773","qid":"352858","title":"Amazon Linux Security Advisory for httpd: ALAS2-2021-1716"},{"cve":"CVE-2021-41773","qid":"500023","title":"Alpine Linux Security Update for apache2"},{"cve":"CVE-2021-41773","qid":"503714","title":"Alpine Linux Security Update for apache2"},{"cve":"CVE-2021-41773","qid":"690017","title":"Free Berkeley Software Distribution (FreeBSD) Security Update for apache httpd (25b78bdd-25b8-11ec-a341-d4c9ef517024)"},{"cve":"CVE-2021-41773","qid":"710595","title":"Gentoo Linux Apache HTTPD Multiple Vulnerabilities (GLSA 202208-20)"},{"cve":"CVE-2021-41773","qid":"87465","title":"Apache Hypertext Transfer Protocol Server (HTTP Server) Path Traversal and Null Pointer Dereference Vulnerabilities"},{"cve":"CVE-2021-41773","qid":"900395","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for httpd (5962)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@apache.org","ID":"CVE-2021-41773","STATE":"PUBLIC","TITLE":"Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Apache HTTP Server","version":{"version_data":[{"version_affected":"=","version_name":"Apache HTTP Server 2.4","version_value":"2.4.49"}]}}]},"vendor_name":"Apache Software Foundation"}]}},"credit":[{"lang":"eng","value":"This issue was reported by Ash Daulton along with the cPanel Security Team"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \"require all denied\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":[{"other":"critical"}],"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://httpd.apache.org/security/vulnerabilities_24.html","name":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"refsource":"MLIST","name":"[httpd-users] 20211005 [users@httpd] CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49","url":"https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E"},{"refsource":"MLIST","name":"[announce] 20211005 CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 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CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/08/4"},{"refsource":"MLIST","name":"[oss-security] 20211008 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/08/6"},{"refsource":"MLIST","name":"[oss-security] 20211008 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/08/5"},{"refsource":"MLIST","name":"[oss-security] 20211009 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/09/1"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html","url":"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html","url":"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html"},{"refsource":"MLIST","name":"[oss-security] 20211011 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/11/4"},{"refsource":"FEDORA","name":"FEDORA-2021-2a10bc68a4","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/"},{"refsource":"FEDORA","name":"FEDORA-2021-aaf90ef84a","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/"},{"refsource":"MLIST","name":"[oss-security] 20211015 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/15/3"},{"refsource":"MLIST","name":"[oss-security] 20211016 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)","url":"http://www.openwall.com/lists/oss-security/2021/10/16/1"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","refsource":"MISC","name":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"refsource":"CONFIRM","name":"https://security.netapp.com/advisory/ntap-20211029-0009/","url":"https://security.netapp.com/advisory/ntap-20211029-0009/"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html","url":"http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html","url":"http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html"},{"refsource":"GENTOO","name":"GLSA-202208-20","url":"https://security.gentoo.org/glsa/202208-20"}]},"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"eng","time":"2021-09-29","value":"reported"},{"lang":"eng","time":"2021-10-01","value":"fixed 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flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \"require all denied\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"41773","Ordinal":"2","NoteData":"2021-10-05","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"41773","Ordinal":"3","NoteData":"2021-11-11","Type":"Other","Title":"Modified"}]}}}