{"id":"CVE-2021-42013","published":"2021-10-07T16:15:09Z","modified":"2026-06-17T04:09:09Z","title":"Apache HTTP Server Path Traversal Vulnerability","vendor":"Apache","product":"HTTP Server","tier":"core","eol":null,"description":{"text":"It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. 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 only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is a path traversal weakness in the HTTP Server product from Apache, in its URL-to-file mapping handling for Alias-like directives, where an incomplete fix for an earlier issue left it open. An unauthenticated remote attacker who can send requests to the server can use crafted paths to reach files outside the configured directories, which can lead to remote code execution if CGI scripts are enabled for those aliased paths and the default \"require all denied\" protection is not in place for the affected files.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:53:22Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.99964,"percentile":0.99976,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","ransomware":true,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-42013","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-11-03","exploitedFirstSeen":"2021-11-03","ransomware":true,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://unit42.paloaltonetworks.com/network-attacks-trends-august-october-2021/","date":"2021-12-21"},{"url":"https://blog.checkpoint.com/security/december-2021s-most-wanted-malware-trickbot-emotet-and-the-log4j-plague/","date":"2022-01-12"},{"url":"https://www.trendmicro.com/en_us/research/22/b/recent-cyberattacks-open-source-web-servers.html","date":"2022-02-22"},{"url":"https://www.fortinet.com/blog/threat-research/enemybot-a-look-into-keksecs-latest-ddos-botnet","date":"2022-04-12"},{"url":"https://static.tenable.com/marketing/whitepapers/Whitepaper-Ransomware_Ecosystem.pdf","date":"2022-06-22"},{"url":"https://www.microsoft.com/en-us/security/blog/2022/12/21/microsoft-research-uncovers-new-zerobot-capabilities/","date":"2022-12-21"},{"url":"https://fortiguard.fortinet.com/threat-signal-report/4926/new-zerobot-variant-exploits-additional-vulnerabilities-for-propagation","date":"2022-12-22"},{"url":"https://cujo.com/blog/the-2022-2023-iot-botnet-report-vulnerabilities-targeted/","date":"2023-04-27"},{"url":"https://cujo.com/the-2022-2023-iot-botnet-report-vulnerabilities-targeted/","date":"2023-04-27"}],"evidenceTotal":834,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev 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Absolute)","mappingType":"exploitation_technique","evidence":[],"comment":"CVE-2021-42013 was introduced as the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50. CVE-2021-42013 is a path traversal vulnerability in Apache HTTP Server 2.4.49 that allows an attacker 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 paths, this could allow for remote code execution.","confidence":"high"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Directory Traversal (Relative and Absolute)","mappingType":"primary_impact","evidence":[],"comment":"CVE-2021-42013 was introduced as the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50. CVE-2021-42013 is a path traversal vulnerability in Apache HTTP Server 2.4.49 that allows an attacker 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. 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and that CVE-2020-7209 was mislabeled as CVE-2017-17106 and CVE-2022-42013 was mislabeled as CVE-2021-42013.","start":4825,"end":5121},{"quote":"CVE-2021-42013","start":12135,"end":12149},{"quote":"CVE-2021-42013","start":13329,"end":13343}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-29001","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-29001","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[{"id":50406,"url":"https://www.exploit-db.com/exploits/50406","title":"Apache HTTP Server 2.4.50 - Path Traversal & Remote Code Execution (RCE)","type":"webapps","platform":"multiple","date":"2021-10-13","verified":true,"provenance":"source"},{"id":50446,"url":"https://www.exploit-db.com/exploits/50446","title":"Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (2)","type":"webapps","platform":"multiple","date":"2021-10-25","verified":false,"provenance":"source"},{"id":50512,"url":"https://www.exploit-db.com/exploits/50512","title":"Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)","type":"webapps","platform":"multiple","date":"2021-11-11","verified":true,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":3,"earliest":"2021-10-13"},"pocGithub":{"count":27,"skipped":10,"earliest":"2021-10-07","earliestUrl":"https://github.com/andrea-mattioli/apache-exploit-CVE-2021-42013","repos":[{"name":"walnutsecurity/cve-2021-42013","url":"https://github.com/walnutsecurity/cve-2021-42013","stars":30,"created":"2021-10-27"},{"name":"Vulnmachines/cve-2021-42013","url":"https://github.com/Vulnmachines/cve-2021-42013","stars":15,"created":"2021-10-08"},{"name":"asaotomo/CVE-2021-42013-Apache-RCE-Poc-Exp","url":"https://github.com/asaotomo/CVE-2021-42013-Apache-RCE-Poc-Exp","stars":10,"created":"2021-12-23"},{"name":"andrea-mattioli/apache-exploit-CVE-2021-42013","url":"https://github.com/andrea-mattioli/apache-exploit-CVE-2021-42013","stars":9,"created":"2021-10-07"},{"name":"TheLastVvV/CVE-2021-42013_Reverse-Shell","url":"https://github.com/TheLastVvV/CVE-2021-42013_Reverse-Shell","stars":7,"created":"2021-10-24"}]},"metasploit":[{"name":"Apache 2.4.49/2.4.50 Traversal RCE scanner","module":"auxiliary/scanner/http/apache_normalize_path","type":"auxiliary","disclosureDate":"2021-05-10","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/apache_normalize_path.rb"},{"name":"Apache 2.4.49/2.4.50 Traversal RCE","module":"exploit/multi/http/apache_normalize_path_rce","type":"exploit","disclosureDate":"2021-05-10","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/apache_normalize_path_rce.rb"}],"nuclei":[{"id":"CVE-2021-42013","name":"Apache 2.4.49/2.4.50 - Path Traversal and Remote Code Execution","severity":"critical","path":"http/cves/2021/CVE-2021-42013.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-42013.yaml"}],"first":{"date":"2021-05-10","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/apache_normalize_path.rb"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html","http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html","http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html","http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html","http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html","https://www.povilaika.com/apache-2-4-50-exploit/","http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html"],"flow":[{"stage":"exploitation","techniques":["T1210"],"provenance":"source"},{"stage":"primary","techniques":["T1059"],"provenance":"source"},{"stage":"observed","techniques":["T1190"],"provenance":"machine","lowConfidence":true}],"timeline":[{"date":"2021-05-10","kind":"exploit-public","label":"First public exploit: Metasploit; 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3 Exploit-DB entries; 1 NVD exploit link; 27 PoC-in-GitHub repos; 2 Metasploit modules; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-apache-http-server-cve-2021-41773","parents":[{"from":"CVE-2021-41773","to":"CVE-2021-42013","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient.","from":"NVD","in":"CVE-2021-42013"},{"kind":"similar","provenance":"machine","score":0.89,"basis":"same product + CWE + description similarity"}]}]}}