SB2025120441 - Multiple vulnerabilities in Apache HTTP Server

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Main Vulnerability Database SB2025120441

SB2025120441 - Multiple vulnerabilities in Apache HTTP Server

Published: December 4, 2025 Updated: December 5, 2025

Security Bulletin ID SB2025120441
Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Input validation error (CVE-ID: CVE-2025-66200)

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input when parsing the RequestHeader directive in .htaccess files. A local user can bypass mod_userdir+suexec security measures via AllowOverride FileInfo and run certain CGI scripts under an unexpected userid.


2) Code injection (CVE-ID: CVE-2025-65082)

The vulnerability allows a local user to affect web server behavior. 

The vulnerability exists due to improper input validation when handling environment variables set via the Apache configuration. A local user can set specially crafted values that supersede variables calculated by the server for CGI programs.


3) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2025-59775)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input when AllowEncodedSlashes is "On" and MergeSlashes is "Off". A remote attacker can send a specially crafted HTTP request and force the web server into leaking NTLM hashes. 

Note, the vulnerability affects Windows installations only. 


4) Improper Neutralization of Server-Side Includes (SSI) Within a Web Page (CVE-ID: CVE-2025-58098)

The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists due to insufficient input validation with Server Side Includes (SSI) enabled and mod_cgid (but not mod_cgi). The web server passes the shell-escaped query string to #exec cmd="..." directives. A remote attacker can send a specially crafted HTTP request to the server and potentially execute arbitrary code.


5) Integer overflow (CVE-ID: CVE-2025-55753)

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to an integer overflow in mod_md (ACME) in the case of failed ACME certificate renewal. The web server will set the backoff timer becoming 0 after a number of failures (~30 days in default configurations), leading to a denial of service condition.


Remediation

Install update from vendor's website.

References