CVE-2025-59775

Server-Side Request Forgery (SSRF) vulnerability 

in Apache HTTP Server on Windows 

with AllowEncodedSlashes Onand MergeSlashes Off allows to potentially leak NTLM 
hashes to a malicious server via SSRF and malicious requests or content

Users are recommended to upgrade to version 2.4.66, which fixes the issue.
SSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
apacheCNA
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CVEADP
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CISA-ADPADP
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 32%
VendorProductVersion
apachehttp_server
2.4.0 ≤
𝑥
< 2.4.66
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
apache2
bullseye
2.4.62-1~deb11u1
fixed
bullseye (security)
2.4.65-1~deb11u1
fixed
bookworm
2.4.66-1~deb12u1
fixed
bookworm (security)
2.4.62-1~deb12u2
fixed
trixie
2.4.66-1~deb13u1
fixed
forky
2.4.66-2
fixed
sid
2.4.66-2
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2025/12/04/6