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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.35 – ≤ 2.4.63 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.64-1 | — |
| Debian 13 | apache2 | 2.4.64-1 | — |
| Debian 12 | apache2 | 2.4.65-1~deb12u1 | — |
| Debian 11 | apache2 | 2.4.65-1~deb11u1 | DLA-4270-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | apache2 | 2.4.58-1ubuntu8.7 | USN-7639-1 |
| Ubuntu 22.04 LTS | apache2 | 2.4.52-1ubuntu4.15 | USN-7639-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | apache2 | 2.4.41-4ubuntu3.23+esm2 | USN-7639-2 |
| Ubuntu Pro 18.04 LTS | apache2 | 2.4.29-1ubuntu4.27+esm6 | USN-7639-2 |
| Ubuntu Pro 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17+esm16 | USN-7639-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | httpd +8 | 2.4.63-1.el10_0.2 | RHSA-2025:15095 |
| RHEL 10 | mod_ssl +1 | 1:2.4.63-1.el10_0.2 | RHSA-2025:15095 |
| RHEL 9 | httpd +8 | 2.4.62-4.el9_6.4 | RHSA-2025:15023 |
| RHEL 9 | mod_ssl +1 | 1:2.4.62-4.el9_6.4 | RHSA-2025:15023 |
| RHEL 8 | httpd +6 | 2.4.37-65.module+el8.10.0+23369+11a81384.5 | RHSA-2025:15123 |
| RHEL 8 | mod_http2 | 1.15.7-10.module+el8.10.0+23369+11a81384.4 | RHSA-2025:15123 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.9.0+19080+567b90f8 | RHSA-2025:15123 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-65.module+el8.10.0+23369+11a81384.5 | RHSA-2025:15123 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | httpd +8 | 2.4.57-11.el9_4.3 | RHSA-2025:14903 |
| RHEL 9.4 EUS | mod_ssl +1 | 1:2.4.57-11.el9_4.3 | RHSA-2025:14903 |
| RHEL 9.2 E4S | httpd +8 | 2.4.53-11.el9_2.13 | RHSA-2025:14902 |
| RHEL 9.2 E4S | mod_ssl +1 | 1:2.4.53-11.el9_2.13 | RHSA-2025:14902 |
| RHEL 9.0 E4S | httpd +7 | 2.4.51-7.el9_0.10 | RHSA-2025:14901 |
| RHEL 9.0 E4S | mod_ssl +1 | 1:2.4.51-7.el9_0.10 | RHSA-2025:14901 |
| RHEL 8.8 E4S | httpd +6 | 2.4.37-56.module+el8.8.0+23464+a2e0c444.10 | RHSA-2025:15619 |
| RHEL 8.8 E4S | mod_http2 | 1.15.7-8.module+el8.8.0+23464+a2e0c444.6 | RHSA-2025:15619 |
| RHEL 8.8 E4S | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15619 |
| RHEL 8.8 E4S | mod_ssl +1 | 1:2.4.37-56.module+el8.8.0+23464+a2e0c444.10 | RHSA-2025:15619 |
| RHEL 8.6 TUS | httpd +6 | 2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.6 TUS | mod_http2 | 1.15.7-5.module+el8.6.0+23463+5d5709c6.4 | RHSA-2025:15698 |
| RHEL 8.6 TUS | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15698 |
| RHEL 8.6 TUS | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.6 E4S | httpd +6 | 2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.6 E4S | mod_http2 | 1.15.7-5.module+el8.6.0+23463+5d5709c6.4 | RHSA-2025:15698 |
| RHEL 8.6 E4S | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15698 |
| RHEL 8.6 E4S | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.6 AUS | httpd +6 | 2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.6 AUS | mod_http2 | 1.15.7-5.module+el8.6.0+23463+5d5709c6.4 | RHSA-2025:15698 |
| RHEL 8.6 AUS | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15698 |
| RHEL 8.6 AUS | mod_ssl +1 | 1:2.4.37-47.module+el8.6.0+23463+5d5709c6.11 | RHSA-2025:15698 |
| RHEL 8.4 EUS Long Life | httpd +6 | 2.4.37-39.module+el8.4.0+23462+1fa78ba3.10 | RHSA-2025:15684 |
| RHEL 8.4 EUS Long Life | mod_http2 | 1.15.7-3.module+el8.4.0+23462+1fa78ba3.4 | RHSA-2025:15684 |
| RHEL 8.4 EUS Long Life | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15684 |
| RHEL 8.4 EUS Long Life | mod_ssl +1 | 1:2.4.37-39.module+el8.4.0+23462+1fa78ba3.10 | RHSA-2025:15684 |
| RHEL 8.4 AUS | httpd +6 | 2.4.37-39.module+el8.4.0+23462+1fa78ba3.10 | RHSA-2025:15684 |
| RHEL 8.4 AUS | mod_http2 | 1.15.7-3.module+el8.4.0+23462+1fa78ba3.4 | RHSA-2025:15684 |
| RHEL 8.4 AUS | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2025:15684 |
| RHEL 8.4 AUS | mod_ssl +1 | 1:2.4.37-39.module+el8.4.0+23462+1fa78ba3.10 | RHSA-2025:15684 |
| RHEL 8.2 AUS | httpd +6 | 2.4.37-21.module+el8.2.0+23461+1d03af5c.10 | RHSA-2025:15516 |
| RHEL 8.2 AUS | mod_http2 | 1.11.3-3.module+el8.2.0+23461+1d03af5c.5 | RHSA-2025:15516 |
| RHEL 8.2 AUS | mod_md | 1:2.0.8-7.module+el8.2.0+5531+7e4d69a2 | RHSA-2025:15516 |
| RHEL 8.2 AUS | mod_ssl +1 | 1:2.4.37-21.module+el8.2.0+23461+1d03af5c.10 | RHSA-2025:15516 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.62-8.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 2.0.29-5.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +1 | 1.2.50-9.redhat_1.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.4.28-10.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_proxy_cluster | 1.3.22-4.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.6-11.el7jbcs | RHSA-2025:13680 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.62-8.el7jbcs | RHSA-2025:13680 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | httpd-manual +1 | 2.4.63-1.el10_0.2 | ALSA-2025:15095 |
| AlmaLinux 9 | httpd +8 | 2.4.62-4.el9_6.4 | ALSA-2025:15023 |
| AlmaLinux 9 | mod_ssl +1 | 1:2.4.62-4.el9_6.4 | ALSA-2025:15023 |
| AlmaLinux 8 | httpd +6 | 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
| AlmaLinux 8 | mod_http2 | 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4 | ALSA-2025:15123 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2025:15123 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5 | ALSA-2025:15123 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | httpd | 2.4.63-1.el10_0.2 | RLSA-2025:15095 |
| Rocky Linux 9 | httpd | 2.4.62-4.el9_6.4 | RLSA-2025:15023 |
| Rocky Linux 8 | httpd | 2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2025:15123 |
| Rocky Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2025:15123 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2025:15123 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02685-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP7 | apache2-devel +4 | 2.4.62-150700.4.3.1 | SUSE-SU-2025:02685-1 |
| SLES 15 SP6 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02684-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP6 | apache2-devel +4 | 2.4.58-150600.5.35.1 | SUSE-SU-2025:02684-1 |
| SLES 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | apache2 +1 | 2.4.51-35.69.1 | SUSE-SU-2025:02565-1 |
| SLES for SAP 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES for SAP 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLES for SAP 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
| SLE HPC 15 SP5 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLE HPC 15 SP4 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2026:2686-1, SUSE-SU-2025:02682-1 |
| SLE HPC 15 SP3 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
| SUSE Manager Server 4.3 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02682-1 |
| SUSE Manager Proxy 4.3 | apache2 | 2.4.51-150400.6.46.1 | SUSE-SU-2025:02682-1 |
| SUSE Enterprise Storage 7.1 | apache2 | 2.4.51-150200.3.82.1 | SUSE-SU-2025:02683-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2 | 2.4.64-1.1 | openSUSE-SU-2025:15360-1 |
| openSUSE Leap 15.6 | apache2 +6 | 2.4.58-150600.5.35.1 | SUSE-SU-2025:02684-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.64-r0 | — |
| Alpine v3.23 | apache2 | 2.4.64-r0 | — |
| Alpine v3.22 | apache2 | 2.4.64-r0 | — |
| Alpine v3.21 | apache2 | 2.4.64-r0 | — |
| Alpine v3.20 | apache2 | 2.4.64-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.64-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | httpd +8 | 2.4.64-1.amzn2023.0.1 | ALAS2023-2025-1125 |
| Amazon Linux 2023 | mod_ssl +1 | 1:2.4.64-1.amzn2023.0.1 | ALAS2023-2025-1125 |
| Amazon Linux 2 | httpd +7 | 2.4.64-1.amzn2.0.1 | ALAS2-2025-2958 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.64-1.amzn2.0.1 | ALAS2-2025-2958 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | httpd | 2.4.64-1 | — |
| Azure Linux 2 (CBL-Mariner) | httpd | 2.4.64-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | httpd +8 | 2.4.63-1.0.1.el10_0.2 | ELSA-2025-15095 |
| Oracle Linux 10 | mod_ssl +1 | 1:2.4.63-1.0.1.el10_0.2 | ELSA-2025-15095 |
| Oracle Linux 9 | httpd +8 | 2.4.62-4.0.1.el9_6.4 | ELSA-2025-15023 |
| Oracle Linux 9 | mod_ssl +1 | 1:2.4.62-4.0.1.el9_6.4 | ELSA-2025-15023 |
| Oracle Linux 8 | httpd +6 | 2.4.37-65.0.1.module+el8.10.0+90652+bef864ba.5 | ELSA-2025-15123 |
| Oracle Linux 8 | mod_http2 | 1.15.7-10.module+el8.10.0+90652+bef864ba.4 | ELSA-2025-15123 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.9.0+90011+2f9c6a23 | ELSA-2025-15123 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-65.0.1.module+el8.10.0+90652+bef864ba.5 | ELSA-2025-15123 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
absholi7ly/CVE-2025-23048-POC ★ 4 · Oct 22, 2025
Apache HTTP Server versions 2.4.35 – 2.4.63 are vulnerable to a client certificate authentication bypass when TLS 1.3 session resumption is used across virtual hosts with different `SSLCACertificateF…
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 36
- WID-SEC-2025-1529 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2025:15023 Moderate: httpd security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:15095 Moderate: httpd security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:15123 Moderate: httpd:2.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:15698 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15684 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15516 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15619 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15123 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15095 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:15023 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:14902 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:14903 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:14901 Red Hat Security Advisory: httpd security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:13680 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP1 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-0162 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 24, 2026
- SUSE-SU-2026:2686-1 Security update for apache2 SUSE / openSUSE Security Updates · Jul 1, 2026
- USN-7639-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-7639-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15360-1 apache2-2.4.64-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02683-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02684-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02682-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02685-1 Security update for apache2 SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4270-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:02565-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2026-0027 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Jan 21, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- RLSA-2025:15023 Moderate: httpd security update Rocky Linux Security Advisories · Oct 10, 2025
- RLSA-2025:15095 Moderate: httpd security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:15123 Moderate: httpd:2.4 security update Rocky Linux Security Advisories · Sep 8, 2025
- ELSA-2025-15123 Moderate: httpd:2.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 4, 2025
- ELSA-2025-15095 Moderate: httpd security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 3, 2025
- ELSA-2025-15023 Moderate: httpd security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 2, 2025
- ALAS2023-2025-1125 Important: httpd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 8, 2025
- ALAS2-2025-2958 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 4, 2025
References
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisory