CVE-2025-49630
HIGH7.5EPSS 2.8%Apache HTTP Server: mod_proxy_http2 denial of service
Published: 7/10/2025Modified: 4/28/2026
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".
Affected packages (3)
- Alpine/apache2from 0, < 2.4.64-r0
- Bitnami/apache>= 2.4.26, < 2.4.64
- Debian/apache2from 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 |
References (7)
- ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2025-49630
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-49630
- WEBhttps://httpd.apache.org/security/vulnerabilities_24.html
- WEBhttps://lists.debian.org/debian-lts-announce/2025/08/msg00009.html
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2025-49630
- WEBhttp://www.openwall.com/lists/oss-security/2025/07/10/2
- WEBhttp://www.openwall.com/lists/oss-security/2025/07/10/7