PoC Index

CVE-2021-41773

KEV RANSOMWARECRITICAL 9.8EPSS 100.0%

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. 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 is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

CVSS v3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v3.1
7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v2.0
4.3 MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N
EPSS
99.99% chance of exploitation in the next 30 days, 100th percentile
CISA KEV
added 2021-11-03, used in ransomware campaigns
Nuclei
high · CWE-22
Published
2021-10-05
Updated
2025-10-21

Proof-of-concept exploits (176)

Nuclei templates (1)

Metasploit modules (1)

ExploitDB entries (2)

Vulhub environments (1)

Exploit collections (3)

References

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