Vulnerability · Published Jul 10, 2025 · Assigned by apache
CVE-2025-49630Apache HTTP Server: mod_proxy_http2 denial of service
High 7.5
In plain English
A high-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:10 | mod_http2 | 2.0.29-2.el10_0.1 | ALSA-2025:14625 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4 | ALSA-2025:15123 |
| AlmaLinux:9 | mod_http2 | 2.0.26-4.el9_6.1 | ALSA-2025:14983 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2025:15123 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+3031+fb177b09 | ALSA-2025:15123 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| Alpine:v3.20 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-49630 |
| Alpine:v3.21 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-49630 |
| Alpine:v3.22 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-49630 |
| Alpine:v3.23 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-49630 |
| Alpine:v3.24 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-49630 |
| Debian:12 | apache2 | 2.4.65-1~deb12u1 | DEBIAN-CVE-2025-49630 |
| Debian:13 | apache2 | 2.4.64-1 | DEBIAN-CVE-2025-49630 |
| Debian:14 | apache2 | 2.4.64-1 | DEBIAN-CVE-2025-49630 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2025:15123 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1840+b070a976.1 | RLSA-2025:15123 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1938+3b7755d4.3 | RLSA-2025:15123 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1984+1bed3124.4 | RLSA-2025:15123 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1842+4a9649e8.2 | RLSA-2025:15123 |
| Rocky Linux:10 | mod_http2 | 0:2.0.29-2.el10_0.1 | RLSA-2025:14625 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2025:15123 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1938+3b7755d4.3 | RLSA-2025:15123 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1883+38ed6c58.1 | RLSA-2025:15123 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1830+22f0c9e0 | RLSA-2025:15123 |
| Rocky Linux:9 | mod_http2 | 0:2.0.26-4.el9_6.1 | RLSA-2025:14983 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2025:15123 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.15 | USN-7639-1 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.15 | UBUNTU-CVE-2025-49630 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.7 | UBUNTU-CVE-2025-49630 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.7 | USN-7639-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.26 – through 2.4.63 |
Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H