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Medium · 4.3 Public exploit CVE-2025-23419 EUVD-2025-3168GHSA-84xh-pwc6-7g4g

TLS Session Resumption Vulnerability

Published Feb 5, 2025 · Updated Jan 23, 2026 · Assigned by f5

Vendor: F5 Product: NGINX Open Source Product: NGINX Plus Package: ingress-nginx-controller-1.15 Package: nginx Package: nginx Package: nginx Package: nginx Category: Network devices Ecosystem: Alpine Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu Ecosystem: Wolfi

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 products

VendorProductAffectedFixed
F5 NGINX Open Source 1.11.4 —
F5 NGINX Plus R17 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 nginx 1.26.3-2 —
Debian 13 nginx 1.26.3-2 —
Debian 12 nginx 1.22.1-9+deb12u1 —
Debian 11 nginx 1.18.0-6.1+deb11u4 DLA-4091-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS nginx 1.24.0-2ubuntu7.3 USN-7285-2
Ubuntu 22.04 LTS nginx 1.18.0-6ubuntu14.6 USN-7285-1
Ubuntu 20.04 LTS nginx 1.18.0-0ubuntu1.7 USN-7285-1
Show 3 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 18.04 LTS nginx No fix yet —
Ubuntu Pro 16.04 LTS nginx No fix yet —
Ubuntu Pro 14.04 LTS nginx No fix yet —

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 9 nginx +9 2:1.20.1-22.el9 RHSA-2025:7331

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed nginx 1.27.4-1.1 openSUSE-SU-2025:14737-1

Alpine

Security tracker ↗
ReleasePackageFixed inAdvisory
Alpine v3.24 nginx 1.26.3-r0 —
Alpine v3.23 nginx 1.26.3-r0 —
Alpine v3.22 nginx 1.26.3-r0 —
Alpine v3.21 nginx 1.26.3-r0 —
Alpine v3.20 nginx 1.26.3-r0 —

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 nginx +9 1:1.26.3-1.amzn2023.0.1 ALAS2023-2025-842

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 nginx 1.25.4-3 —
Azure Linux 2 (CBL-Mariner) nginx 1.22.1-13 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 nginx +9 2:1.20.1-22.0.1.el9 ELSA-2025-7331

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling ingress-nginx-controller-1.15 1.15.0-r0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 10

References