CVE-2021-41773

Apache HTTP Server Path Traversal Vulnerability

n/a

CVSS

100.0%

EPSS (exploit prob.)

100.0%

EPSS percentile

Yes

Actively exploited

Yes

Ransomware use

2021-11-03

Added

MITRE ATT&CK techniques

How this vulnerability maps to adversary behaviour, from the Center for Threat-Informed Defense's public CVE→ATT&CK mappings. Use it to check whether your detections already cover the technique.

Technique	Name	Relationship
T1210	Exploitation of Remote Services	exploitation technique
T1059	Command and Scripting Interpreter	primary impact

Summary

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.

Affected software

Vendor: Apache · Product: HTTP Server

Weakness types (CWE):

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

Related vulnerabilities in Apache

CVE	Name	EPSS	Exploited
CVE-2021-44228	Apache Log4j2 Remote Code Execution Vulnerability	100.0%	Yes
CVE-2021-40438	Apache HTTP Server-Side Request Forgery (SSRF)	100.0%	Yes
CVE-2017-5638	Apache Struts Remote Code Execution Vulnerability	100.0%	Yes
CVE-2013-2251	Apache Struts Improper Input Validation Vulnerability	100.0%	Yes
CVE-2018-11776	Apache Struts Remote Code Execution Vulnerability	100.0%	Yes
CVE-2017-12617	Apache Tomcat Remote Code Execution Vulnerability	100.0%	Yes
CVE-2024-45195	Apache OFBiz Forced Browsing Vulnerability	100.0%	Yes
CVE-2021-45046	Apache Log4j2 Deserialization of Untrusted Data Vulnerability	100.0%	Yes

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