--- title: "CVE-2021-41773: Path traversal and file disclosure… | CubePath" 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…" language: en source: https://cubepath.com/security/cve/CVE-2021-41773 --- # CVE-2021-41773: Path traversal and file disclosure… | CubePath ## 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. Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-41773) ## Key data ### CVSS 3.1 High 7.5 Score published by CISA-ADP in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | None | No effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.99992 (99.99% probability) Percentile 99.98% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Apache HTTP Server Path Traversal Vulnerability Added to the catalog Nov 3, 2021 Federal due date Nov 17, 2021 Ransomware campaigns Known use ### CISA assessment as of Feb 4, 2025 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-22](https://cwe.mitre.org/data/definitions/22.html) Improper Limitation of a Pathname to a Restricted Directory ## Affected products Products listed in the CVE record, as the CNA published them. - Apache HTTP Server - affected: Apache HTTP Server 2.4 2.4.49 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [httpd.apache.org/security/vulnerabilities\_24.html](https://httpd.apache.org/security/vulnerabilities%5F24.html) - [\[httpd-users\] 20211005 \[users@httpd\] CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49](https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[announce\] 20211005 CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49](https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E) (lists.apache.org) mailing-list - [\[oss-security\] 20211005 CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49](http://www.openwall.com/lists/oss-security/2021/10/05/2) (openwall.com) mailing-list - [\[oss-security\] 20211007 RE: CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49](http://www.openwall.com/lists/oss-security/2021/10/07/1) (openwall.com) mailing-list - [\[announce\] 20211007 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)](https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E) (lists.apache.org) mailing-list - [\[httpd-users\] 20211007 \[users@httpd\] 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)](https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[oss-security\] 20211007 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)](http://www.openwall.com/lists/oss-security/2021/10/07/6) (openwall.com) mailing-list - [20211007 Apache HTTP Server Vulnerabilties: October 2021](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ) (tools.cisco.com) vendor-advisory - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/1) (openwall.com) mailing-list - [\[httpd-cvs\] 20211008 \[httpd-site\] branch main updated: \* Align with CVE-2021-42013 based on the latest findings](https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E) (lists.apache.org) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/2) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/3) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/4) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/6) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/08/5) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/09/1) (openwall.com) mailing-list - [packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4…](http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html) - [packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4…](http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html) - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/11/4) (openwall.com) mailing-list - [FEDORA-2021-2a10bc68a4](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/) (lists.fedoraproject.org) vendor-advisory - [FEDORA-2021-aaf90ef84a](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/) (lists.fedoraproject.org) vendor-advisory - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/15/3) (openwall.com) mailing-list - [\[oss-security\] 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)](http://www.openwall.com/lists/oss-security/2021/10/16/1) (openwall.com) mailing-list - [oracle.com/security-alerts/cpujan2022.html](https://www.oracle.com/security-alerts/cpujan2022.html) - [security.netapp.com/advisory/ntap-20211029-0009](https://security.netapp.com/advisory/ntap-20211029-0009/) - [packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-T…](http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html) - [packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4…](http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html) - [GLSA-202208-20](https://security.gentoo.org/glsa/202208-20) (security.gentoo.org) vendor-advisory ## Timeline 1. ID reserved Sep 29, 2021 2. Record published Oct 5, 2021 3. Added to CISA KEV Nov 3, 2021 4. Record last updated Oct 21, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:38 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)