Updated: 2025-08-20 03:18:25.670982
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".
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | NONE | 0.0 |
| CVSS Version 3.x | HIGH | 7.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | httpd | 2.4.53 | 7.5 | HIGH | Released | CLSA-2025:1757501175 | 2025-09-10 13:43:50 | |
| AlmaLinux 9.2 ESU | mod_http2 | 1.15.19 | 7.5 | HIGH | Released | CLSA-2025:1762784415 | 2025-11-10 16:26:04 | |
| CentOS 8.4 ELS | httpd | 2.4.37 | 7.5 | HIGH | Released | CLSA-2025:1758914697 | 2025-09-26 23:51:16 | |
| CentOS 8.5 ELS | httpd | 2.4.37 | 7.5 | HIGH | Released | CLSA-2025:1758915354 | 2025-09-26 23:51:14 | |
| CentOS Stream 8 ELS | httpd | 2.4.37 | 7.5 | HIGH | Released | CLSA-2025:1758914381 | 2025-09-26 23:51:17 | |
| Ubuntu 16.04 ELS | apache2 | 2.4.18 | 7.5 | HIGH | Not Vulnerable | 2025-08-28 00:52:59 | ||
| Ubuntu 18.04 ELS | apache2 | 2.4.29 | 7.5 | HIGH | Released | CLSA-2025:1756324356 | 2025-08-28 00:52:58 |