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

CVE-2021-42013 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

An incomplete patch for CVE-2021-41773 in Apache HTTP Server 2.4.50 allows for path traversal and potential remote code execution. Attackers can map URLs to files outside the document root if Alias-like directives are used without 'require all denied' protections, or execute arbitrary code if CGI scripts are enabled.

Technologies: Apache HTTP Server. Vendors: Apache.

Quick answers

Is CVE-2021-42013 exploited in the wild?
Yes. CVE-2021-42013 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-42013?
Critical severity, with a CVSS score of 9.8, published 3 November 2021.
Which products and versions are affected?
Apache HTTP Server 2.4.49, 2.4.50.
Is there a fix for CVE-2021-42013?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-42013 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2021-42013?
Check whether you run Apache HTTP Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Apache HTTP Server 2.4.49, 2.4.50

Timeline

  • 2021-11-03: disclosed
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: advisory: NVD publication date

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