CVE-2025-23419
published 2025-02-05CVE-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…
PriorityP426medium4.3CVSS 3.1
AVNACLPRLUINSUCLINAN
EPSS
2.65%
83.9th percentile
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.
Affected
22 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | nginx | < nginx 1.22.1-9+deb12u1 (bookworm) | nginx 1.22.1-9+deb12u1 (bookworm) |
| f5 | nginx | — | — |
| f5 | nginx | >= 0 < 1.26.3-r0 | 1.26.3-r0 |
| f5 | nginx | >= 0 < 1.26.3-r0 | 1.26.3-r0 |
| f5 | nginx | >= 0 < 1.26.3-r0 | 1.26.3-r0 |
| f5 | nginx | >= 0 < 1.26.3-r0 | 1.26.3-r0 |
| f5 | nginx | >= 0 < 1.18.0-6.1+deb11u4 | 1.18.0-6.1+deb11u4 |
| f5 | nginx | >= 0 < 1.22.1-9+deb12u1 | 1.22.1-9+deb12u1 |
| f5 | nginx | >= 0 < 1.26.3-2 | 1.26.3-2 |
| f5 | nginx | >= 0 < 1.26.3-2 | 1.26.3-2 |
| f5 | nginx | >= 1.11.4 < 1.26.3 | 1.26.3 |
| f5 | nginx | >= 1.27.0 < 1.27.4 | 1.27.4 |
| f5 | nginx_open_source | >= 1.11.4 < * | * |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | >= R17 < * | * |
| f5 | nginx_plus | >= r28 < r32 | r32 |
| msrc | azl3_nginx_1.25.4-3_on_azure_linux_3.0 | — | — |
| msrc | azl3_nginx_1.25.4-4_on_azure_linux_3.0 | — | — |
| msrc | cbl2_nginx_1.22.1-13_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
nvdv4.05.3MEDIUMCVSS: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
osv5.3MEDIUM
vendor_debian5.3MEDIUM
vendor_redhat5.3MEDIUM
vendor_msrc4.3MEDIUM
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GHSA
GHSA-84xh-pwc6-7g4g: When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate
ghsa_unreviewed·2025-02-05
CVE-2025-23419 [MEDIUM] CWE-287 GHSA-84xh-pwc6-7g4g: When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumption to bypass client certificate
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.
OSV
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
osv·2025-02-05·CVSS 5.3
CVE-2025-23419 [MEDIUM] 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
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.
OSV
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
osv·2025-02-05·CVSS 5.3
CVE-2025-23419 [MEDIUM] 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
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.
Ubuntu
nginx vulnerability
vendor_ubuntu·2025-04-01
CVE-2025-23419 nginx vulnerability
Title: nginx vulnerability
Summary: nginx could be made to bypass client certificate authentication
requirements.
USN-7285-1 fixed vulnerabilities in nginx.
This update provides the corresponding updates for Ubuntu 24.04 LTS.
Original advisory details:
It was discovered that nginx incorrectly handled when multiple
server blocks are configured to share the same IP address and port.
An attacker could use this issue to use session resumption to bypass
client certificate authentication requirements on these servers.
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
nginx vulnerability
vendor_ubuntu·2025-02-24
CVE-2025-23419 nginx vulnerability
Title: nginx vulnerability
Summary: Several security issues were fixed in nginx.
It was discovered that nginx incorrectly handled when multiple
server blocks are configured to share the same IP address and port.
An attacker could use this issue to use session resumption to bypass
client certificate authentication requirements on these servers.
This issue only affected Ubuntu 24.10.
A buffer overflow and a null pointer deref was fixed in nginx rtmp module
(#LP 1977718). This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS.
Instructions: In general, a standard system update will make all the necessary changes.
Microsoft
TLS Session Resumption Vulnerability
vendor_msrc·2025-02-11·CVSS 4.3
CVE-2025-23419 [MEDIUM] CWE-287 TLS Session Resumption Vulnerability
TLS Session Resumption Vulnerability
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
f5: f5
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azur
Red Hat
nginx: TLS Session Resumption Vulnerability
vendor_redhat·2025-02-05·CVSS 5.3
CVE-2025-23419 [MEDIUM] CWE-287 nginx: TLS Session Resumption Vulnerability
nginx: TLS Session Resumption Vulnerability
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.
A flaw was found in nginx. When name-based virtual hosts are configured to share the same IP address and port combinati
F5
CVE-2025-23419: When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumpt...
vendor_f5·2025-02-05·CVSS 4.3
CVE-2025-23419 [MEDIUM] CWE-863 CVE-2025-23419: When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumpt...
CVE-2025-23419: When multiple server blocks are configured to share the same IP address and port, an attacker can use session resumpt...
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.
Affected Products: NGINX,
Debian
CVE-2025-23419: nginx - When multiple server blocks are configured to share the same IP address and port...
vendor_debian·2025·CVSS 5.3
CVE-2025-23419 [MEDIUM] CVE-2025-23419: nginx - When multiple server blocks are configured to share the same IP address and port...
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.
Scope: local
bookworm: resolved (fixed in 1.22.1-9+deb12u1)
bullseye: resolved (fixed in 1.18.0-6.1+deb11u4)
forky: resolved (fixed in 1.26.3-2)
sid: resolved (fixed
No detection rules found.
No public exploits indexed.
2025-02-05
Published