CVE-2025-23048

Name	CVE-2025-23048
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4270-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache2 (PTS)	bullseye	2.4.62-1~deb11u1	vulnerable
	bullseye (security)	2.4.65-1~deb11u1	fixed
	bookworm	2.4.65-1~deb12u1	fixed
	bookworm (security)	2.4.62-1~deb12u2	vulnerable
	trixie	2.4.65-2	fixed
	forky, sid	2.4.65-3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
apache2	source	bullseye	2.4.65-1~deb11u1	DLA-4270-1
apache2	source	bookworm	2.4.65-1~deb12u1
apache2	source	(unstable)	2.4.64-1

Notes

https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2025-23048
Fixed by: https://github.com/apache/httpd/commit/c4cfa50c9068e8b8134c530ab21674e77d1278a2
possible regression for misconfigured load balancer
NEWS: https://salsa.debian.org/apache-team/apache2/-/blob/0874e522244079e8436b576ac7ae0527f2ce97f1/debian/apache2.NEWS