CVE-2025-59775 Apache HTTP Server: NTLM Leakage on Windows through UNC SSRF
Attackers can leak NTLM hashes via SSRF on Windows Apache servers with specific non-default slash handling configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59775?
CVE-2025-59775 is a high-severity server-side request forgery vulnerability in Apache Http Server, published on 5 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Server-Side Request Forgery (SSRF) vulnerability
in Apache HTTP Server on Windows
with AllowEncodedSlashes On and 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.
Weakness: CWE-918
Which versions are affected by CVE-2025-59775?
1 open source package ship an affected version, including apache. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.0 | 2.4.66 |
Products include Apache Http Server.
How do I fix CVE-2025-59775?
Upgrade apache to 2.4.66 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2025-59775 being exploited?
There is no known exploitation of CVE-2025-59775 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2025-59775, BELL-CVE-2025-59775, BIT-apache-2025-59775, GHSA-7w72-74p3-5cfq, MINI-94h9-w4gf-6chr.