Access Control Bypass in Apache HTTP Server with mod_ssl
CVE-2025-23048

9.1CRITICAL

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
10 July 2025

What is CVE-2025-23048?

In certain configurations of mod_ssl within Apache HTTP Server versions 2.4.35 to 2.4.63, a vulnerability may allow an authenticated client, trusted by one virtual host, to gain unauthorized access to another virtual host. This occurs when SSLStrictSNIVHostCheck is not enabled across these virtual hosts configured with different sets of trusted client certificates. Such settings pose a risk particularly in environments utilizing TLS 1.3 session resumption, suggesting a need for careful setup to ensure proper access controls are sustained.

Affected Version(s)

Apache HTTP Server 2.4.35 <= 2.4.63

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sven Hebrok, Felix Cramer, Tim Storm, Maximilian Radoy, and Juraj Somorovsky at Paderborn University
.
CVE-2025-23048 : Access Control Bypass in Apache HTTP Server with mod_ssl