CVE-2025-49630
Apache HTTP Server: mod_proxy_http2 denial of service
CVSS v3
7.5
HIGH
EPSS Score
2.8 %
exploit probability
CISA KEV
No
known exploited
Exploitation
none
SSVC status
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".
Technical details
- CVSS v3 Vector
- 3.1
- Published
- 2025-07-10
- Last Modified
- 2025-11-04
Frequently asked questions
What is CVE-2025-49630?
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".
Is CVE-2025-49630 actively exploited?
Active exploitation of CVE-2025-49630 has not been confirmed. The EPSS score is 2.8%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-49630?
CVE-2025-49630 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string 3.1.
Is CVE-2025-49630 affecting your environment?
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