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 Details
- CVSS 4.0 Base Score: 5.3 (MEDIUM)
- 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)
- CVSS 3.1 Base Score: 4.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade nginx | Aug 8, 2025 | Feb 5, 2025 |
| Amazon Linux Ami 2 | — | Upgrade nginx-mod-develUpgrade nginx-mod-http-perlUpgrade nginx-mod-http-xslt-filterUpgrade nginx-debuginfoUpgrade nginx-mod-http-image-filterUpgrade nginx-mod-streamUpgrade nginx-coreUpgrade nginx-mod-mailUpgrade nginxUpgrade nginx-all-modulesUpgrade nginx-mod-http-geoipUpgrade nginx-filesystem | Mar 27, 2025 | Feb 5, 2025 |
| Amazon_linux_2023 | — | Upgrade nginx-mod-streamUpgrade nginx-debuginfoUpgrade nginx-mod-http-perlUpgrade nginx-debugsourceUpgrade nginx-mod-develUpgrade nginx-mod-http-xslt-filterUpgrade nginx-mod-http-image-filter-debuginfoUpgrade nginx-mod-mailUpgrade nginx-core-debuginfoUpgrade nginx-mod-mail-debuginfoUpgrade nginx-mod-http-image-filterUpgrade nginx-filesystemUpgrade nginx-mod-http-xslt-filter-debuginfoUpgrade nginx-coreUpgrade nginx-mod-stream-debuginfoUpgrade nginxUpgrade nginx-all-modulesUpgrade nginx-mod-http-perl-debuginfo | Feb 26, 2025 | Feb 5, 2025 |
| Debian | — | Upgrade nginx | Mar 17, 2025 | Feb 5, 2025 |
| Freebsd | — | Upgrade nginx-develUpgrade nginx | Feb 6, 2025 | Feb 5, 2025 |
| Gentoo Linux | — | Upgrade www-servers/nginx. | Aug 17, 2026 | Aug 17, 2026 |
| Nginx | — | Upgrade to nginx version 1.27.4Upgrade to nginx version 1.26.3 | Feb 6, 2025 | Feb 5, 2025 |
| Oracle_linux | — | Upgrade nginx-filesystemUpgrade nginx-all-modulesUpgrade nginx-mod-mailUpgrade nginx-mod-http-image-filterUpgrade nginxUpgrade nginx-coreUpgrade nginx-mod-http-perlUpgrade nginx-mod-streamUpgrade nginx-mod-develUpgrade nginx-mod-http-xslt-filter | May 26, 2025 | Feb 5, 2025 |
| Redhat_linux | — | Upgrade nginx-filesystemUpgrade nginxUpgrade nginx-coreUpgrade nginx-all-modulesUpgrade nginx-mod-mailUpgrade nginx-mod-http-xslt-filter-debuginfoUpgrade nginx-mod-http-perl-debuginfoUpgrade nginx-mod-http-perlUpgrade nginx-mod-mail-debuginfoUpgrade nginx-mod-http-image-filter-debuginfoUpgrade nginx-mod-stream-debuginfoNo solution existsUpgrade nginx-mod-http-image-filterUpgrade nginx-mod-streamUpgrade nginx-mod-develUpgrade nginx-debuginfoUpgrade nginx-mod-http-xslt-filterUpgrade nginx-core-debuginfoUpgrade nginx-debugsource | May 14, 2025 | Feb 5, 2025 |
| Suse | — | Upgrade nginx-sourceUpgrade nginx | Dec 5, 2025 | Jun 1, 2025 |
| Ubuntu | — | Upgrade nginxUpgrade nginx-lightUpgrade nginx-extrasUpgrade nginx-docUpgrade nginx-devUpgrade libnginx-mod-rtmpUpgrade nginx-fullUpgrade nginx-coreUpgrade nginx-common | Feb 25, 2025 | Feb 5, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 20, 2025 | Feb 5, 2025 |
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