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CVE-2021-41773: Apache HTTP Server Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2021-41773
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Apacheproduct: HTTP ServerRemote code executionPath traversal
What
A path traversal vulnerability allows remote code execution under certain conditions.
Who is affected
Users of Apache HTTP Server are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Review and apply the latest patches from Apache.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-41773

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-41773coverage & exploitation statusNVD · CVE.org

Recent advisories for Apache HTTP Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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