CVE-2025-23048: Apache HTTP Server

Critical severity, CVSS 9.1. EPSS: 1% chance of exploitation in the next 30 days.

In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path setting). In such a case, a client trusted to access one virtual host may be able to access another virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host.

Affected products

• Apache HTTP Server: from 2.4.35, before 2.4.64 (fixed in 2.4.64)

Published 2025-07-10. Last modified 2026-06-17.