CVE-2025-23048
Apache HTTP Server: mod_ssl access control bypass with session resumption
Description
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.
How to fix CVE-2025-23048
To remediate CVE-2025-23048, 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-2025-23048 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2.4.64-r0
- >= 2.4.35, < 2.4.64
- from 0, < 2.4.65-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |