Vulnerability Description
When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate authentication requirements on these servers. This vulnerability arises when TLS Session Tickets https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key are used and/or the SSL session cache https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache are used in the default server and the default server is performing client certificate authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Nginx | >= 1.11.4, < 1.26.3 |
| F5 | Nginx Plus | >= r28, < r32 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://my.f5.com/manage/s/article/K000149173Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/02/05/8Mailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/03/msg00017.htmlIssue TrackingThird Party Advisory
FAQ
What is CVE-2025-23419?
CVE-2025-23419 is a vulnerability with a CVSS score of 4.3 (MEDIUM). When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate authentication requirements on these servers. This...
How severe is CVE-2025-23419?
CVE-2025-23419 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-23419?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Nginx, F5 Nginx Plus, Debian Debian Linux.