Detections
Analytics
CVE-2021-41773
critical
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.
References
https://www.oracle.com/security-alerts/cpujan2022.html
https://security.netapp.com/advisory/ntap-20211029-0009/
https://security.gentoo.org/glsa/202208-20
http://www.openwall.com/lists/oss-security/2021/10/16/1
http://www.openwall.com/lists/oss-security/2021/10/15/3
http://www.openwall.com/lists/oss-security/2021/10/11/4
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/07/6
https://hackread.com/linux-cryptominer-using-legit-sites-to-spread-malware/
https://thehackernews.com/2025/07/hackers-exploit-apache-http-server-flaw.html
https://www.edgescan.com/wp-content/uploads/2024/03/2023-Vulnerability-Statistics-Report.pdf
https://isc.sans.edu/diary/rss/31528
https://www.infosecurity-magazine.com/news/androxgh0st-botnet-adopts-mozi/
https://hackread.com/androxgh0st-botnet-integrate-mozi-iot-vulnerabilities/
https://www.ic3.gov/Media/News/2024/241010.pdf
https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-207a
https://isc.sans.edu/diary/rss/31086
https://blogs.juniper.net/en-us/security/shielding-networks-against-androxgh0st
https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-016a
https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-215a
https://www.tenable.com/cyber-exposure/a-look-inside-the-ransomware-ecosystem
https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective
https://www.tenable.com/blog/aa23-215a-2022s-top-routinely-exploited-vulnerabilities
https://www.tenable.com/blog/cve-2021-41773-path-traversal-zero-day-in-apache-http-server-exploited
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773
https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/1
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html