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CVE-2021-42013

CriticalCVSS 9.8 / 10
Published Oct 7, 2021·Last modified Apr 16, 2026
Affected Components(0)

No affected components available

Description

It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.

Risk Scores
Base Score
9.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
9.8

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
99.96%

The exploit probability is critical. The vulnerability is very likely to be exploited in the next 30 days.

Exploit
36 exploits

36 exploits found for this vulnerability.

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