CVE-2025-49630CWE-617

Apache HTTP Server: mod_proxy_http2 denial of service

High · published July 10, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
71.3
In the wild
Unconfirmed
What it is

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 mod_proxy_http2.

Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01352 · 71.3th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2025-07-10T16:57Z
EPSS history
Timeline
  • 10 JUL 16:57Z
    Apache HTTP Server: mod_proxy_http2 denial of service
    cvelistv5