# CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49

> CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-41773
Last updated: 2025-10-21T23:25:30Z

- Published: 2021-10-05 08:40 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: apache
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known
- CWE: CWE-22

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apache Software Foundation: Apache HTTP Server

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-41773)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-41773)
- [http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html](http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html)
- [http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html](http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-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/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/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html)
- [https://httpd.apache.org/security/vulnerabilities\_24.html](https://httpd.apache.org/security/vulnerabilities_24.html)
- [https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E](https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%2540%3Ccvs.httpd.apache.org%3E)
- [https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E](https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%2540%3Cusers.httpd.apache.org%3E)
- [https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E](https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%2540%3Cannounce.apache.org%3E)
- [https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E](https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%2540%3Cannounce.apache.org%3E)
- [https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E](https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%2540%3Cusers.httpd.apache.org%3E)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/)
- [https://security.gentoo.org/glsa/202208-20](https://security.gentoo.org/glsa/202208-20)
- [https://security.netapp.com/advisory/ntap-20211029-0009/](https://security.netapp.com/advisory/ntap-20211029-0009/)
- [https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ)
- [https://www.oracle.com/security-alerts/cpujan2022.html](https://www.oracle.com/security-alerts/cpujan2022.html)
- [http://www.openwall.com/lists/oss-security/2021/10/05/2](http://www.openwall.com/lists/oss-security/2021/10/05/2)
- [http://www.openwall.com/lists/oss-security/2021/10/07/1](http://www.openwall.com/lists/oss-security/2021/10/07/1)
- [http://www.openwall.com/lists/oss-security/2021/10/07/6](http://www.openwall.com/lists/oss-security/2021/10/07/6)
- [http://www.openwall.com/lists/oss-security/2021/10/08/1](http://www.openwall.com/lists/oss-security/2021/10/08/1)
- [http://www.openwall.com/lists/oss-security/2021/10/08/2](http://www.openwall.com/lists/oss-security/2021/10/08/2)
- [http://www.openwall.com/lists/oss-security/2021/10/08/3](http://www.openwall.com/lists/oss-security/2021/10/08/3)
- [http://www.openwall.com/lists/oss-security/2021/10/08/4](http://www.openwall.com/lists/oss-security/2021/10/08/4)
- [http://www.openwall.com/lists/oss-security/2021/10/08/5](http://www.openwall.com/lists/oss-security/2021/10/08/5)
- [http://www.openwall.com/lists/oss-security/2021/10/08/6](http://www.openwall.com/lists/oss-security/2021/10/08/6)
- [http://www.openwall.com/lists/oss-security/2021/10/09/1](http://www.openwall.com/lists/oss-security/2021/10/09/1)
- [http://www.openwall.com/lists/oss-security/2021/10/11/4](http://www.openwall.com/lists/oss-security/2021/10/11/4)
- [http://www.openwall.com/lists/oss-security/2021/10/15/3](http://www.openwall.com/lists/oss-security/2021/10/15/3)
- [http://www.openwall.com/lists/oss-security/2021/10/16/1](http://www.openwall.com/lists/oss-security/2021/10/16/1)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-41773 · Markdown: https://rewindex.com/cve/CVE-2021-41773.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-41773 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:16.036Z