Is CVE-2021-41773 actively exploited?

Yes. CVE-2021-41773 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-41773 be exploited remotely?

The attack vector of CVE-2021-41773 has not been classified yet.

What is the CVSS score of CVE-2021-41773?

CVE-2021-41773 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-41773

HIGHCISA KEVIN THE WILD

CVE-2021-41773

Published: November 3, 2021

EPSS:94.39%probability of exploitation in 30 daysPercentile:100.0th

Official Description

Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default �require all denied� or if CGI scripts are enabled. The original patch issued under this CVE ID is insufficient, please review remediation information under CVE-2021-42013.

NVD Source

CISA KEV Advisory

Apache HTTP Server Path Traversal Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Apache HTTP Server has a path traversal vulnerability that can lead to remote code execution, especially if certain directory configurations are not set to 'require all denied' or if CGI scripts are enabled. This is a HIGH severity vulnerability with a high EPSS score of 0.94391, indicating a high likelihood of exploitation. CISA has confirmed its exploitation in the KEV catalog, but note that the initial patch was insufficient and further remediation under CVE-2021-42013 is required.

This vulnerability is actively being exploited in the wild. It can be exploited remotely, particularly in misconfigured environments.

Recommended Action

Apache HTTP Server administrators must apply the latest security patches, specifically addressing CVE-2021-42013, which supersedes the initial insufficient patch for CVE-2021-41773. Ensure that 'require all denied' is configured for directories not explicitly needing access and disable CGI scripts if not essential.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-41773 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-41773 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.