Security News > 2021 > October > Apache fixes actively exploited zero-day vulnerability, patch now
The Apache Software Foundation has released version 2.4.50 of the HTTP Web Server to address two vulnerabilities, one of which is an actively exploited path traversal and file disclosure flaw.
The Apache HTTP Server is an open-source, cross-platform web server that is extremely popular for being versatile, robust, and free.
The actively exploited zero-day vulnerability is tracked as CVE-2021-41773 and it enables actors to map URLs to files outside the expected document root by launching a path traversal attack.
For the attack to work, the target has to run Apache HTTP Server 2.4.49, and also has to have the "Require all denied" access control parameter disabled.
Since the disclosure of the vulnerability, security researchers have been able to reproduce the vulnerability and warned that admins should patch immediately.
We have reproduced the fresh CVE-2021-41773 Path Traversal vulnerability in Apache 2.4.49.
News URL
Related news
- Apple Releases Patch for WebKit Zero-Day Vulnerability Exploited in Targeted Attacks (source)
- Microsoft March 2025 Patch Tuesday fixes 7 zero-days, 57 flaws (source)
- Choose your own Patch Tuesday adventure: Start with six zero day fixes, or six critical flaws (source)
- Patch Tuesday: Microsoft Fixes 57 Security Flaws – Including Active Zero-Days (source)
- Apache Tomcat Vulnerability Actively Exploited Just 30 Hours After Public Disclosure (source)
- Critical Veeam Backup & Replication RCE vulnerability fixed, patch ASAP! (CVE-2025-23120) (source)
- New Windows zero-day leaks NTLM hashes, gets unofficial patch (source)
- Zero-Day Alert: Google Releases Chrome Patch for Exploit Used in Russian Espionage Attacks (source)
- CrushFTP: Patch critical vulnerability ASAP! (CVE-2025-2825) (source)
- Mozilla Patches Critical Firefox Bug Similar to Chrome’s Recent Zero-Day Vulnerability (source)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2021-10-05 | CVE-2021-41773 | Path Traversal vulnerability in multiple products A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. | 7.5 |