Denial of Service Vulnerability in Apache HTTP Server Proxy Configurations
CVE-2025-49630

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
10 July 2025

What is CVE-2025-49630?

A denial of service vulnerability exists in Apache HTTP Server 2.4.26 to 2.4.63 when certain proxy configurations are in place. This issue can be exploited by untrusted clients causing an assertion failure in mod_proxy_http2. Affected installations that utilize a reverse proxy with ProxyPreserveHost set to 'on' are particularly susceptible. Administrators are advised to review their configurations and apply necessary security measures to mitigate the risk.

Affected Version(s)

Apache HTTP Server 2.4.26 <= 2.4.63

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anthony CORSIEZ
.
CVE-2025-49630 : Denial of Service Vulnerability in Apache HTTP Server Proxy Configurations