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Unrated severityNVD Advisory· Published Jul 10, 2025· Updated Nov 4, 2025

Apache HTTP Server: mod_proxy_http2 denial of service

CVE-2025-49630

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".

Affected products

2
  • Apache/HTTP Serverllm-fuzzy
    Range: >=2.4.26 <=2.4.63
  • Apache Software Foundation/Apache HTTP Serverv5
    Range: 2.4.26

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

News mentions

0

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