{"id":"UBUNTU-CVE-2025-23419","details":"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.","modified":"2026-07-02T18:01:04.443181834Z","published":"2025-02-05T18:15:00Z","related":["USN-7285-1"],"upstream":["CVE-2025-23419"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-23419"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-23419"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2025/02/05/8"},{"type":"REPORT","url":"https://github.com/nginx/nginx/commit/13935cf9fdc3c8d8278c70716417d3b71c36140e"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7285-1"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/nginx?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-3ubuntu1","1.4.3-2ubuntu1","1.4.4-1ubuntu1","1.4.4-2ubuntu1","1.4.4-4ubuntu1","1.4.5-1ubuntu1","1.4.6-1ubuntu2","1.4.6-1ubuntu3","1.4.6-1ubuntu3.1","1.4.6-1ubuntu3.2","1.4.6-1ubuntu3.3","1.4.6-1ubuntu3.4","1.4.6-1ubuntu3.5","1.4.6-1ubuntu3.6","1.4.6-1ubuntu3.7","1.4.6-1ubuntu3.8","1.4.6-1ubuntu3.9","1.4.6-1ubuntu3.9+esm1","1.4.6-1ubuntu3.9+esm2","1.4.6-1ubuntu3.9+esm3","1.4.6-1ubuntu3.9+esm4","1.4.6-1ubuntu3.9+esm5","1.4.6-1ubuntu3.9+esm6","1.4.6-1ubuntu3.9+esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"nginx","binary_version":"1.4.6-1ubuntu3.9+esm8"},{"binary_name":"nginx-common","binary_version":"1.4.6-1ubuntu3.9+esm8"},{"binary_name":"nginx-core","binary_version":"1.4.6-1ubuntu3.9+esm8"},{"binary_version":"1.4.6-1ubuntu3.9+esm8","binary_name":"nginx-extras"},{"binary_version":"1.4.6-1ubuntu3.9+esm8","binary_name":"nginx-full"},{"binary_name":"nginx-light","binary_version":"1.4.6-1ubuntu3.9+esm8"},{"binary_version":"1.4.6-1ubuntu3.9+esm8","binary_name":"nginx-naxsi"},{"binary_name":"nginx-naxsi-ui","binary_version":"1.4.6-1ubuntu3.9+esm8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-23419.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nginx?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.3-1ubuntu1","1.9.6-2ubuntu1","1.9.6-2ubuntu2","1.9.9-0ubuntu1","1.9.9-1ubuntu1","1.9.10-0ubuntu1","1.9.10-1ubuntu1","1.9.11-0ubuntu1","1.9.11-0ubuntu2","1.9.12-0ubuntu1","1.9.13-0ubuntu1","1.9.14-0ubuntu1","1.9.15-0ubuntu1","1.10.0-0ubuntu0.16.04.1","1.10.0-0ubuntu0.16.04.2","1.10.0-0ubuntu0.16.04.3","1.10.0-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.1","1.10.3-0ubuntu0.16.04.2","1.10.3-0ubuntu0.16.04.3","1.10.3-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.5","1.10.3-0ubuntu0.16.04.5+esm1","1.10.3-0ubuntu0.16.04.5+esm2","1.10.3-0ubuntu0.16.04.5+esm3","1.10.3-0ubuntu0.16.04.5+esm4","1.10.3-0ubuntu0.16.04.5+esm5","1.10.3-0ubuntu0.16.04.5+esm6","1.10.3-0ubuntu0.16.04.5+esm7","1.10.3-0ubuntu0.16.04.5+esm9"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm9","binary_name":"nginx"},{"binary_name":"nginx-common","binary_version":"1.10.3-0ubuntu0.16.04.5+esm9"},{"binary_name":"nginx-core","binary_version":"1.10.3-0ubuntu0.16.04.5+esm9"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm9","binary_name":"nginx-extras"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm9","binary_name":"nginx-full"},{"binary_name":"nginx-light","binary_version":"1.10.3-0ubuntu0.16.04.5+esm9"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-23419.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/nginx?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.1-0ubuntu2","1.13.6-2ubuntu1","1.13.6-2ubuntu2","1.13.10-1ubuntu1","1.13.12-0ubuntu1","1.14.0-0ubuntu1","1.14.0-0ubuntu1.1","1.14.0-0ubuntu1.2","1.14.0-0ubuntu1.3","1.14.0-0ubuntu1.4","1.14.0-0ubuntu1.5","1.14.0-0ubuntu1.6","1.14.0-0ubuntu1.7","1.14.0-0ubuntu1.9","1.14.0-0ubuntu1.10","1.14.0-0ubuntu1.11","1.14.0-0ubuntu1.11+esm1","1.14.0-0ubuntu1.11+esm2","1.14.0-0ubuntu1.11+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.0-0ubuntu1.11+esm4","binary_name":"libnginx-mod-http-auth-pam"},{"binary_name":"libnginx-mod-http-cache-purge","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_name":"libnginx-mod-http-dav-ext","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_name":"libnginx-mod-http-echo","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_name":"libnginx-mod-http-fancyindex","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_version":"1.14.0-0ubuntu1.11+esm4","binary_name":"libnginx-mod-http-geoip"},{"binary_name":"libnginx-mod-http-headers-more-filter","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_name":"libnginx-mod-http-image-filter","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binary_name":"libnginx-mod-http-lua","binary_version":"1.14.0-0ubuntu1.11+esm4"},{"binar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