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How the CVE Works
CVE-2025-23048 affects Apache HTTP Server (2.4.35 to 2.4.63) when using mod_ssl with multiple virtual hosts, each restricted to different client certificates. If `SSLStrictSNIVHostCheck` is disabled, a trusted client for one virtual host can resume a TLS 1.3 session to access another host, bypassing access controls. This occurs due to improper session resumption validation in mod_ssl, allowing certificate trust boundaries to be violated.
DailyCVE Form
Platform: Apache HTTP Server
Version: 2.4.35 – 2.4.63
Vulnerability: TLS 1.3 bypass
Severity: Critical
Date: 07/29/2025
Prediction: Patch by 08/15/2025
What Undercode Say
Analytics:
openssl s_client -connect target:443 -tls1_3 -reconnect grep "SSLStrictSNIVHostCheck" httpd.conf
How Exploit:
- Attacker resumes TLS 1.3 session.
- Bypasses client cert checks.
- Accesses restricted virtual hosts.
Protection from this CVE:
- Enable
SSLStrictSNIVHostCheck. - Upgrade Apache HTTP Server.
- Isolate virtual hosts.
Impact:
- Unauthorized data access.
- Privilege escalation.
- Trust boundary violation.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
