CVE-2025-49630
HIGHApache 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
- 7/10/2025
- Last Modified
- 11/4/2025
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?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.