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Public proof of conceptFix available

CVE-2025-23419

A public proof of concept exists; no exploitation attested.

  • Published2025-02-05
  • Fixed inr32
  • WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-02-0518:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-23419?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-23419?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
F5 nginx plus
BranchAffectedFixed in
—≥ r28, < r32r32
—= r32no fix published
—= r33no fix published
nginx
BranchAffectedFixed in
1.27≥ 1.27.0, < 1.27.41.27.4
1.x≥ 1.11.4, < 1.26.31.26.3
Debian debian linux
BranchAffectedFixed in
11.0= 11.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2025-23419 Red Hat Product Security99 products fixed · 44 known affected

    nginx: TLS Session Resumption Vulnerability

    nginx.src as a component of Red Hat Ansible Automation Platform 1.2 · nginx-all-modules (nginx:1.22) as a component of Red Hat Enterprise Linux 8 · nginx-all-modules (nginx:1.24) as a component of Red Hat Enterprise Linux 8 · +41 more

  • RHSA-2025:7331 Red Hat Product Security99 products fixed

    Red Hat Security Advisory: nginx security update

Full record on NVD

Fix

  1. Update F5 nginx plus to r32
  2. Vendor fix Red Hat Product Security RHSA-2025:7331 · 99 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Workaround from the vendor Red Hat Product Security RHSA-2025:7331 · 99 productsMitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.
  4. No fix available, says the vendor Red Hat Product Security CVE-2025-23419 · 22 productsFix deferred
  5. No fix planned, says the vendor Red Hat Product Security CVE-2025-23419 · 22 productsWill not fix

Advisories and patches

Detection

read 2026-10-23 18:47 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedharley-ghostie/safe-check-CVE-2025-23419xitexploiter96-dot/CVE-2025-23419
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-02-05
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.05.3read 2026-10-23
  • CNACVSS 3.14.3read 2026-10-23
  • CNAweakness (CWE)CWE-863read 2026-10-23
  • NVDweakness (CWE)CWE-863read 2026-10-23
  • FIRST EPSSEPSS score2.8 %2026-10-22
  • PoC-in-GitHubproof of concept2read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 4.0 vector
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
Published
2025-02-05
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2025-23419?

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.

Is CVE-2025-23419 actively exploited?

Active exploitation of CVE-2025-23419 has not been confirmed. Its EPSS score was 2.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-23419?

CVE-2025-23419 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

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