CVE-2025-23048
Publication date 10 July 2025
Last updated 20 August 2025
Ubuntu priority
In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path setting). In such a case, a client trusted to access one virtual host may be able to access another virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| apache2 | 25.04 plucky |
Fixed 2.4.63-1ubuntu1.1
|
| 24.04 LTS noble |
Fixed 2.4.58-1ubuntu8.7
|
|
| 22.04 LTS jammy |
Fixed 2.4.52-1ubuntu4.15
|
|
| 20.04 LTS focal |
Fixed 2.4.41-4ubuntu3.23+esm2
|
|
| 18.04 LTS bionic |
Fixed 2.4.29-1ubuntu4.27+esm6
|
|
| 16.04 LTS xenial |
Fixed 2.4.18-2ubuntu3.17+esm16
|
|
| 14.04 LTS trusty |
Needs evaluation
|
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| Parameter | Value |
|---|---|
| Base score |
9.1 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-7639-1
- Apache HTTP Server vulnerabilities
- 16 July 2025
- USN-7639-2
- Apache HTTP Server vulnerabilities
- 19 August 2025