Vulnerability · Published Feb 5, 2025 · Assigned by f5
CVE-2025-23419TLS Session Resumption Vulnerability
Medium 4.3
In plain English
A medium-severity incorrect authorization in NGINX Open Source from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.8% (higher than 87% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | nginx | 1.26.3-r0 | ALPINE-CVE-2025-23419 |
| Alpine:v3.21 | nginx | 1.26.3-r0 | ALPINE-CVE-2025-23419 |
| Alpine:v3.22 | nginx | 1.26.3-r0 | ALPINE-CVE-2025-23419 |
| Alpine:v3.23 | nginx | 1.26.3-r0 | ALPINE-CVE-2025-23419 |
| Alpine:v3.24 | nginx | 1.26.3-r0 | ALPINE-CVE-2025-23419 |
| Debian:12 | nginx | 1.22.1-9+deb12u1 | DEBIAN-CVE-2025-23419 |
| Debian:13 | nginx | 1.26.3-2 | DEBIAN-CVE-2025-23419 |
| Debian:14 | nginx | 1.26.3-2 | DEBIAN-CVE-2025-23419 |
| Ubuntu:22.04:LTS | nginx | 1.18.0-6ubuntu14.6 | USN-7285-1 |
| Ubuntu:22.04:LTS | nginx | 1.18.0-6ubuntu14.6 | UBUNTU-CVE-2025-23419 |
| Ubuntu:24.04:LTS | nginx | 1.24.0-2ubuntu7.3 | UBUNTU-CVE-2025-23419 |
| Ubuntu:24.04:LTS | nginx | 1.24.0-2ubuntu7.3 | USN-7285-2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| F5 | NGINX Open Source | 1.11.4 – before * |
| F5 | NGINX Plus | R17 – before * |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N