Medium severity · published Dec 5, 2025
CVE-2025-66200
mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server
5.4
CVSS
0.6%
EPSS
No
On KEV
Description
mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid.
This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65.
Users are recommended to upgrade to version 2.4.66, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · Apache
2.4.7 before 2.4.66 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66200
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66200
Vendor Advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Issue Tracking
http://www.openwall.com/lists/oss-security/2025/12/04/8
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