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Vulnerability DatabaseCVE-2025-49630

CVE-2025-49630: 
Apache HTTP Server vulnerability analysis and mitigation

Overview

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. The vulnerability affects configurations where a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on" (Apache Security, NVD).

Technical details

The vulnerability is tracked as CVE-2025-49630 and has been assigned a CVSS v3.1 base score of 7.5 HIGH (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). The issue specifically occurs in the modproxyhttp2 module when handling missing host headers in certain proxy configurations (NVD, Snyk). The vulnerability is classified as CWE-617: Reachable Assertion.

Impact

When successfully exploited, this vulnerability can result in a total loss of availability of the Apache HTTP Server. The attack can cause the server to crash, leading to a denial of service condition that persists while the attacker continues to deliver the attack (Snyk).

Mitigation and workarounds

Users are recommended to upgrade to Apache HTTP Server version 2.4.64, which contains the fix for this vulnerability. The issue affects versions 2.4.26 through 2.4.63 (Apache Security).

Additional resources

Source: This report was generated using AI

Related Apache HTTP Server vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-23048CRITICAL9.1
  • Apache HTTP ServerApache HTTP Server
  • mod_proxy_html
NoYesJul 10, 2025
CVE-2025-53020HIGH7.5
  • Apache HTTP ServerApache HTTP Server
  • httpd-devel
NoYesJul 10, 2025
CVE-2025-49630HIGH7.5
  • Apache HTTP ServerApache HTTP Server
  • cpe:2.3:a:apache:http_server
NoYesJul 10, 2025
CVE-2025-49812HIGH7.4
  • Apache HTTP ServerApache HTTP Server
  • httpd:2.4::httpd-tools
NoYesJul 10, 2025
CVE-2025-54090MEDIUM6.3
  • Apache HTTP ServerApache HTTP Server
  • httpd-manual
NoYesJul 23, 2025

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