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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://my.f5.com/manage/s/article/K000149173	Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/02/05/8	Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/03/msg00017.html	Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:f5:nginx::::::::
	cpe:2.3:a:f5:nginx::::::::
	cpe:2.3:a:f5:nginx_plus::::::::
	cpe:2.3:a:f5:nginx_plus:r32:-::::::
	cpe:2.3:a:f5:nginx_plus:r32:p1::::::
	cpe:2.3:a:f5:nginx_plus:r33:-::::::
	cpe:2.3:a:f5:nginx_plus:r33:p1::::::

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-02-05 18:15

Updated : 2026-01-27 13:30

NVD link : CVE-2025-23419

Mitre link : CVE-2025-23419

CVE.ORG link : CVE-2025-23419

JSON object : View

Products Affected

debian

debian_linux

f5

nginx_plus
nginx

CWE

CWE-863

Incorrect Authorization

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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.\u00a0\u00a0\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}, {"lang": "es", "value": "Cuando se configuran varios bloques de servidores para compartir la misma direcci\u00f3n IP y puerto, un atacante puede usar la reanudaci\u00f3n de sesi\u00f3n para eludir los requisitos de autenticaci\u00f3n de certificados de cliente en estos servidores. Esta vulnerabilidad surge cuando se utilizan tickets de sesi\u00f3n TLS https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key y/o se utiliza la cach\u00e9 de sesi\u00f3n SSL https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache en el servidor predeterminado y este est\u00e1 realizando la autenticaci\u00f3n de certificados de cliente. Nota: Las versiones de software que han llegado al final del soporte t\u00e9cnico (EoTS) no se eval\u00faan."}], "lastModified": "2026-01-27T13:30:41.190", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "90E7462C-FF90-4463-BB1C-8B9BC94FFA54", "versionEndExcluding": "1.26.3", "versionStartIncluding": "1.11.4"}, {"criteria": "cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "34709BDE-C5EF-4D44-8BDC-0791B6A15E5E", "versionEndExcluding": "1.27.4", "versionStartIncluding": "1.27.0"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "684EDE01-D672-43C3-A447-BECB6C5D2033", "versionEndExcluding": "r32", "versionStartIncluding": "r28"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:r32:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "36C4308E-651E-437C-84E7-10C542E3ADC2"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA913184-EAAD-409E-99C6-AB979DAA93F3"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:r33:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "514B0A2A-E2FD-4DB7-B5B8-5C59F1D60AD8"}, {"criteria": "cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "46DC49B8-7286-4867-9CDA-1C1B469CD304"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "f5sirt@f5.com"}