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CVE-2021-42013: Apache HTTP Server Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2021-42013
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. This CVE ID resolves an incomplete patch for CVE-2021-41773.

CSIRTS triage

vendor: Apacheproduct: HTTP ServerPath traversalRemote code execution
What
Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution.
Who is affected
Deployments of Apache HTTP Server with misconfigured Alias-like directives.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Apache HTTP Server.

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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-2021-42013

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-2021-42013coverage & 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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