CVE-2021-41773
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
In short
Apache HTTP Server 2.4.49 has a flaw in how it processes file paths, allowing attackers to access files outside intended directories through specially crafted URLs. If those files aren't properly protected, attackers could read sensitive data or run malicious code if CGI scripts are enabled.
Technical detail
A path normalization bypass in Apache 2.4.49 enables directory traversal attacks to map URLs to files outside Alias-like directive scopes. The vulnerability requires files outside configured directories to lack default "require all denied" protections; exploitation can lead to information disclosure or RCE if CGI execution is permitted on aliased paths. This issue affects only version 2.4.49 and is actively exploited in the wild.
Summary generated and translated by AI from the official 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Apache Software Foundation · Apache HTTP Serverpublic PoCs found — 150
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11githubgithub.com/1nhann/CVE-2021-41773★ 9githubgithub.com/aqiao-jashell/CVE-2021-41773★ 9githubgithub.com/theLSA/apache-httpd-path-traversal-checker★ 9githubgithub.com/knqyf263/CVE-2021-41773★ 9githubgithub.com/numanturle/CVE-2021-41773★ 8githubgithub.com/creadpag/CVE-2021-41773-POC★ 8githubgithub.com/0xRar/CVE-2021-41773★ 7githubgithub.com/aqiao-jashell/py-CVE-2021-41773★ 7githubgithub.com/Hydragyrum/CVE-2021-41773-Playground★ 6githubgithub.com/TishcaTpx/POC-CVE-2021-41773★ 6githubgithub.com/noflowpls/CVE-2021-41773★ 6githubgithub.com/RevShellXD/LFI-Destruction★ 4githubgithub.com/OfriOuzan/CVE-2021-41773_CVE-2021-42013_Exploits★ 4githubgithub.com/apapedulimu/Apachuk★ 4githubgithub.com/LudovicPatho/CVE-2021-41773★ 4githubgithub.com/jbovet/CVE-2021-41773★ 4githubgithub.com/twseptian/cve-2021-41773★ 4githubgithub.com/superzerosec/CVE-2021-41773★ 3githubgithub.com/Habib0x0/CVE-2021-41773★ 3githubgithub.com/habibiefaried/CVE-2021-41773-PoC★ 3githubgithub.com/Soliux/CVE-2021-41773★ 2githubgithub.com/jheeree/Simple-CVE-2021-41773-checker★ 2githubgithub.com/iosifache/ApacheRCEEssay★ 2githubgithub.com/Kouf320/docker-lab-cve-2017-5638-cve-2021-41773★ 2githubgithub.com/CyberQuestor-infosec/CVE-2021-41773-Apache_2.4.49-Path-traversal-to-RCE★ 2githubgithub.com/lopqto/CVE-2021-41773_Honeypot★ 2githubgithub.com/walnutsecurity/cve-2021-41773★ 2githubgithub.com/Zyx2440/Apache-HTTP-Server-2.4.50-RCE★ 2githubgithub.com/orangmuda/CVE-2021-41773★ 2githubgithub.com/5gstudent/cve-2021-41773-and-cve-2021-42013★ 2githubgithub.com/mightysai1997/CVE-2021-41773S★ 1githubgithub.com/klmntbelgium/cve-2021-41773-exploration★ 1githubgithub.com/im2sinister/CVE-2021-41773★ 1githubgithub.com/AssassinUKG/CVE-2021-41773★ 1githubgithub.com/masahiro331/CVE-2021-41773★ 1githubgithub.com/PentesterGuruji/CVE-2021-41773★ 1githubgithub.com/r00tVen0m/CVE-2021-41773★ 1githubgithub.com/n3k00n3/CVE-2021-41773★ 1githubgithub.com/vinhjaxt/CVE-2021-41773-exploit★ 1githubgithub.com/shellreaper/CVE-2021-41773★ 1githubgithub.com/corelight/CVE-2021-41773★ 1githubgithub.com/EagleTube/CVE-2021-41773★ 1githubgithub.com/ksanchezcld/httpd-2.4.49★ 1githubgithub.com/zerodaywolf/CVE-2021-41773_42013★ 1githubgithub.com/MazX0p/CVE-2021-41773★ 1githubgithub.com/IcmpOff/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution-Exploit★ 1githubgithub.com/kubota/POC-CVE-2021-41773★ 1githubgithub.com/mightysai1997/CVE-2021-41773m★ 1githubgithub.com/TheKernelPanic/exploit-apache2-cve-2021-41773★ 1githubgithub.com/retrymp3/apache2.4.49VulnerableLabSetup★ 1githubgithub.com/Iris288/CVE-2021-41773★ 1githubgithub.com/psibot/apache-vulnerable★ 1githubgithub.com/charanvoonna/CVE-2021-41773★ 1githubgithub.com/adrianmafandy/CVE-2021-41773★ 1githubgithub.com/pirenga/CVE-2021-41773★ 0githubgithub.com/abds059/APACHE-PATH-TRAVERSAL-RCE-CVE-2021-41773-★ 0githubgithub.com/xMohamed0/CVE-2021-41773★ 0githubgithub.com/i6c/MASS_CVE-2021-41773★ 0githubgithub.com/skentagon/CVE-2021-41773★ 0githubgithub.com/bernardas/netsec-polygon★ 0githubgithub.com/pisut4152/Sigma-Rule-for-CVE-2021-41773-and-CVE-2021-42013-exploitation-attempt★ 0githubgithub.com/anldori/CVE-2021-41773-Scanner★ 0githubgithub.com/shiomiyan/CVE-2021-41773★ 0githubgithub.com/Hattan515/POC-CVE-2021-41773★ 0githubgithub.com/pwn3z/CVE-2021-41773-Apache-RCE★ 0githubgithub.com/EkamSinghWalia/Mitigation-Apache-CVE-2021-41773-★ 0githubgithub.com/mightysai1997/cve-2021-41773★ 0githubgithub.com/mightysai1997/CVE-2021-41773h★ 0githubgithub.com/mightysai1997/cve-2021-41773-v-★ 0githubgithub.com/mightysai1997/CVE-2021-41773-i-★ 0githubgithub.com/mightysai1997/CVE-2021-41773-L-★ 0githubgithub.com/mightysai1997/CVE-2021-41773-PoC★ 0githubgithub.com/mightysai1997/CVE-2021-41773.git1★ 0githubgithub.com/fnatalucci/CVE-2021-41773-RCE★ 0githubgithub.com/sixpacksecurity/CVE-2021-41773★ 0githubgithub.com/dileepdkumar/LayarKacaSiber-CVE-2021-41773★ 0githubgithub.com/ranggaggngntt/CVE-2021-41773★ 0githubgithub.com/mohwahyudi/cve-2021-41773★ 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0githubgithub.com/Taldrid1/cve-2021-41773★ 0githubgithub.com/tiemio/SSH-key-and-RCE-PoC-for-CVE-2021-41773★ 0githubgithub.com/Vanshuk-Bhagat/Apache-HTTP-Server-Vulnerabilities-CVE-2021-41773-and-CVE-2021-42013★ 0githubgithub.com/javaamo/CVE-2021-41773★ 0githubgithub.com/ashique-thaha/CVE-2021-41773-POC★ 0githubgithub.com/khaidtraivch/CVE-2021-41773-Apache-2.4.49-★ 0githubgithub.com/JIYUN02/cve-2021-41773★ 0githubgithub.com/AzkOsDev/CVE-2021-41773★ 0githubgithub.com/Joapath/CVE-2021-41773★ 0githubgithub.com/blu3ming/PoC-CVE-2021-41773★ 0githubgithub.com/r0otk3r/CVE-2021-41773★ 0githubgithub.com/mah4nzfr/CVE-2021-41773★ 0githubgithub.com/hackedrishi/CTF_WRITEUPS-TryHackMe-CVE-2021-41773-★ 0githubgithub.com/MuhammadHuzaifaAsif/security-lab★ 0githubgithub.com/gunzf0x/CVE-2021-41773★ 0githubgithub.com/Mahfujurjust/CVE-2021-41773★ 0githubgithub.com/faizdotid/CVE-2021-41773★ 0githubgithub.com/ChanaPCN/CVE-2021-41773-Analysis★ 0githubgithub.com/sudo0xksh/cve-2021-41773-checker★ 0githubgithub.com/dserdyk3-arch/Serdyuk-DO-homework-CVE-2021-41773★ 0githubgithub.com/ISabbiI/PoC-Apache-CVE-2021-41773-Infrastructure-LAB★ 0githubgithub.com/Nanxsec/exploitApache★ 0githubgithub.com/zubairahm3d/apache-cve-2021-41773-lab★ 0githubgithub.com/tsiddiquea/cve-reproduction-lab★ 0githubgithub.com/LayarKacaSiber/CVE-2021-41773★ 0githubgithub.com/BabyTeam1024/CVE-2021-41773★ 0githubgithub.com/twseptian/cve-2021-41773-docker-lab★ 0githubgithub.com/TheLastVvV/CVE-2021-41773★ 0cve_referencepacketstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlunverifiedcve_referencepacketstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.htmlunverifiedexploitdbwww.exploit-db.com/exploits/50383unverifiedcve_referencepacketstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlunverifiedexploitdbwww.exploit-db.com/exploits/50512unverifiedcve_referencepacketstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.htmlunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. 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http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.htmlhttp://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlhttps://httpd.apache.org/security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3Ehttps://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3Ehttps://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/