Vulnerability DatabaseCVE-2025-49630
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CVE-2025-49630
July 10, 2025
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 Packages
https://github.com/apache/httpd.git (GITHUB):
Affected version(s) >=2.4.26 <2.4.64
Fix Suggestion:
Update to version 2.4.64
Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (6)
https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2025/07/10/2
https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html
https://security-tracker.debian.org/tracker/CVE-2025-49630
http://www.openwall.com/lists/oss-security/2025/07/10/7
https://security.alpinelinux.org/vuln/CVE-2025-49630
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Reachable Assertion
CWE-617
EPSS
Base Score:
0.79