CRITICAL

CVE-2025-23048

CVSS v3

9.1

CRITICAL

EPSS Score

1.0 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

apacheBitnamifrom 2.4.35 · fixed in 2.4.64
httpdAlmaLinux:9all versions · fixed in 2.4.62-4.el9_6.4and 8 other packages
httpdAlmaLinux:8all versions · fixed in 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5and 6 other packages
httpd-manualAlmaLinux:10all versions · fixed in 2.4.63-1.el10_0.2and 1 other package
mod_http2AlmaLinux:8all versions · fixed in 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4
mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.6.0+3031+fb177b09
mod_sslAlmaLinux:9all versions · fixed in 1:2.4.62-4.el9_6.4and 1 other package
mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5and 1 other package

Vendor advisories

CVE-2025-23048 Red Hat Product Security764 products fixed
httpd: mod_ssl: access control bypass by trusted clients is possible using TLS 1.3 session resumption
RHSA-2025:15698 Red Hat Product Security135 products fixed
Red Hat Security Advisory: httpd:2.4 security update
RHSA-2025:15684 Red Hat Product Security50 products fixed
Red Hat Security Advisory: httpd:2.4 security update
RHSA-2025:15619 Red Hat Product Security45 products fixed
Red Hat Security Advisory: httpd:2.4 security update
RHSA-2025:15516 Red Hat Product Security25 products fixed
Red Hat Security Advisory: httpd:2.4 security update
RHSA-2025:15123 Red Hat Product Security85 products fixed
Red Hat Security Advisory: httpd:2.4 security update

7 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2025-07-10
Last Modified: 2025-11-04

Frequently asked questions

What is CVE-2025-23048?

Is CVE-2025-23048 actively exploited?

Active exploitation of CVE-2025-23048 has not been confirmed. Its EPSS score was 1.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-23048?

CVE-2025-23048 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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