CVE-2025-49630

HIGH

Apache HTTP Server 2.4.26-2.4.63 - Denial of Service via mod_proxy_http2 Assertion

Title source: llm
STIX 2.1

Description

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".

References (4)

Core 4

Scores

CVSS v3 7.5
EPSS 0.0115
EPSS Percentile 62.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-617
Status published
Products (1)
apache/http_server 2.4.26 - 2.4.64
Published Jul 10, 2025
Tracked Since Feb 18, 2026