CVE-2025-49630
Apache HTTP Server: mod_proxy_http2 denial of service
7.5
HIGH
CVSS 3.1
EPSS 4.7%
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".
How to fix CVE-2025-49630
To remediate CVE-2025-49630, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.64-r0 or later
- —upgrade to 2.4.64 or later
- —upgrade to 2.4.65-1~deb11u1 or later
Is CVE-2025-49630 being exploited?
Low — EPSS is 4.7%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2.4.64-r0
- >= 2.4.26, < 2.4.64
- from 0, < 2.4.65-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |