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Fencer Vulns
medium 4.3

CVE-2025-23419 json

TLS Session Resumption Vulnerability

published 2025-02-05 21 mo ago modified 2026-09-08 2 mo ago also BIT-nginx-2025-23419 , BIT-nginx-gateway-2025-23419 , EUVD-2025-3168

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami nginx 1.26.3, 1.27.4
  • bitnami nginx-gateway 1.26.3, 1.27.4
  • F5 NGINX Open Source 1.26.3, 1.27.4
  • F5 NGINX Plus R32 P2, R33 P2
  • nginx Debian 12 1.22.1-9+deb12u1
  • nginx Debian 14, Debian 13 1.26.3-2

debian advisories DEBIAN-CVE-2025-23419

  • nginx Ubuntu 20.04 LTS 1.18.0-0ubuntu1.7
  • nginx Ubuntu 22.04 LTS 1.18.0-6ubuntu14.6
  • nginx Ubuntu 24.04 LTS 1.24.0-2ubuntu7.3

ubuntu advisories UBUNTU-CVE-2025-23419

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx RHEL 9 2:1.20.1-22.el9
  • nginx-core RHEL 9 2:1.20.1-22.el9
  • nginx-mod-mail RHEL 9 2:1.20.1-22.el9
  • nginx-filesystem RHEL 9 2:1.20.1-22.el9
  • nginx-mod-stream RHEL 9 2:1.20.1-22.el9
  • nginx-all-modules RHEL 9 2:1.20.1-22.el9
  • nginx-mod-http-perl RHEL 9 2:1.20.1-22.el9
  • nginx-mod-http-xslt-filter RHEL 9 2:1.20.1-22.el9

red hat advisories RHSA-2025:7331

  • nginx openSUSE Tumbleweed 1.27.4-1.1

opensuse advisories openSUSE-SU-2025:14737-1

  • nginx Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 1.26.3-r0

alpine advisories ALPINE-CVE-2025-23419

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx CBL-Mariner 2.0 1.22.1-13
  • nginx Azure Linux 3.0 1.25.4-3

azure linux advisories AZL-56483AZL-56492

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-23419 updated cvss 4.3

nginx: TLS Session Resumption Vulnerability

  • Red Hat Ansible Automation Platform 1.2 nginx Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more
    affected: workaround, no fix available “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.”
  • Red Hat Enterprise Linux 9 nginx, nginx-core, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, +3 more
    affected: workaround, no fix planned “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.”
  • Red Hat Lightspeed proxy 1 insights-proxy-container-rhel9
    affected: workaround, no fix available “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.”
  • Red Hat Enterprise Linux AppStream (v. 9) nginx 1.20.1-22.el9, nginx-core 1.20.1-22.el9, nginx-mod-mail 1.20.1-22.el9, nginx-filesystem 1.20.1-22.el9, nginx-mod-stream 1.20.1-22.el9, nginx-all-modules 1.20.1-22.el9, +3 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nginx-debuginfo 1.20.1-22.el9, nginx-mod-devel 1.20.1-22.el9, nginx-debugsource 1.20.1-22.el9, nginx-core-debuginfo 1.20.1-22.el9, nginx-mod-mail-debuginfo 1.20.1-22.el9, nginx-mod-stream-debuginfo 1.20.1-22.el9, +3 more
    fixed: vendor fix “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.” RHSA-2025:7331
  • Red Hat Enterprise Linux 9 nginx, nginx-core, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, +3 more Red Hat Enterprise Linux 10 nginx
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

2.79% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA 4.0 5.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 5.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
bitnami nginx
>=1.11.4, <1.26.3
>=1.27.0, <1.27.4
1.26.3
1.27.4
bitnami nginx-gateway
>=1.11.4, <1.26.3
>=1.27.0, <1.27.4
1.26.3
1.27.4

Affected products

  • F5 NGINX Open Source
  • F5 NGINX Plus

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.