Cryptographic issues in Apache HTTP Server - CVE-2025-49812

Vulnerability identifier: #VU112728

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-49812

CWE-ID: CWE-310

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to he way certain mod_ssl configurations handle TLS upgrades. A remote attacker can launch an HTTP desynchronisation attack, which allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.

Note, only configurations using "SSLEngine optional" to enable TLS upgrades are affected.

Apache HTTP Server
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
Anolis OS
SUSE Enterprise Storage
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Ubuntu
Server Applications Module
Basesystem Module
SUSE Package Hub 15
openSUSE Leap
openEuler
Fedora
SecurityCenter
EasyApache
IBM Qradar SIEM
Juniper Secure Analytics (JSA)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
mod_http2
mod_md
httpd (Red Hat package)
httpd
httpd-devel
httpd-tools
mod_ldap
mod_proxy_html
mod_session
mod_ssl
httpd-manual
apache2 (Ubuntu package)
httpd-filesystem
httpd-help
httpd-debugsource
httpd-debuginfo
apache2-doc
apache2-tls13-doc
apache2-example-pages
apache2-tls13-utils-debuginfo
apache2-tls13
apache2
apache2-devel
apache2-tls13-prefork
apache2-worker
apache2-prefork-debuginfo
apache2-tls13-debugsource
apache2-tls13-debuginfo
apache2-prefork
apache2-debugsource
apache2-tls13-worker-debuginfo
apache2-utils
apache2-tls13-prefork-debuginfo
apache2-worker-debuginfo
apache2-debuginfo
apache2-tls13-devel
apache2-tls13-worker
apache2-tls13-utils
apache2-utils-debuginfo
apache2-tls13-example-pages
apache2-event
apache2-event-debuginfo
apache2-manual
apache2-prefork-debugsource
apache2-worker-debugsource
apache2-utils-debugsource
apache2-event-debugsource
httpd-core
mod_lua
httpd-doc
Total Storage Service Console (TSSC) / TS4500 IMC

Install updates from vendor's website.

Apache HTTP Server - update to 2.4.64
SecurityCenter - update to SC-202508.1
EasyApache - update to 4 25-24
IBM Qradar SIEM - update to 7.5.0 Update Pack 14 IF01
Juniper Secure Analytics (JSA) - update to 7.5.0 UP14 IF01
mod_http2 - update to 1.15.7-10
mod_md - update to 2.0.8-8
httpd (Red Hat package) - addressed in versions 2.2.15-71.el6_10.1, 2.4.6-90.el7_7.6, 2.4.6-99.el7_9.6, 2.4.51-7.el9_0.10, 2.4.53-11.el9_2.13, 2.4.57-11.el9_4.3, 2.4.63-1.el10_0.2
httpd - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
httpd-devel - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
httpd-tools - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
mod_ldap - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
mod_proxy_html - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
mod_session - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
mod_ssl - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
httpd-manual - addressed in versions 2.4.6-99, 2.4.37-655.0.1, 2.4.62-3
apache2 (Ubuntu package) - addressed in versions 2.4.7-1ubuntu4.22+esm12, 2.4.18-2ubuntu3.17+esm16, 2.4.18-2ubuntu3.17+esm17, 2.4.29-1ubuntu4.27+esm6, 2.4.29-1ubuntu4.27+esm7, 2.4.29-1ubuntu4.27+esm8, 2.4.41-4ubuntu3.23+esm2, 2.4.41-4ubuntu3.23+esm3, 2.4.52-1ubuntu4.15, 2.4.58-1ubuntu8.7, 2.4.63-1ubuntu1.1
httpd-filesystem - addressed in versions 2.4.37-655.0.1, 2.4.62-3
mod_md - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-help - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-filesystem - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
mod_ssl - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
mod_session - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
mod_proxy_html - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
mod_ldap - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-tools - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-devel - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-debugsource - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd-debuginfo - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
httpd - addressed in versions 2.4.43-28, 2.4.51-25, 2.4.58-10
apache2-doc - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.66-150400.6.57.1
apache2-tls13-doc - update to 2.4.51-35.69.1
apache2-example-pages - addressed in versions 2.4.51-35.69.1, 2.4.51-150400.6.46.1, 2.4.66-150400.6.57.1
apache2-tls13-utils-debuginfo - update to 2.4.51-35.69.1
apache2-tls13 - update to 2.4.51-35.69.1
apache2 - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-devel - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-prefork - update to 2.4.51-35.69.1
apache2-worker - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-prefork-debuginfo - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-debugsource - update to 2.4.51-35.69.1
apache2-tls13-debuginfo - update to 2.4.51-35.69.1
apache2-prefork - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-debugsource - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-worker-debuginfo - update to 2.4.51-35.69.1
apache2-utils - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-prefork-debuginfo - update to 2.4.51-35.69.1
apache2-worker-debuginfo - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-debuginfo - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-devel - update to 2.4.51-35.69.1
apache2-tls13-worker - update to 2.4.51-35.69.1
apache2-tls13-utils - update to 2.4.51-35.69.1
apache2-utils-debuginfo - addressed in versions 2.4.51-35.69.1, 2.4.51-150200.3.82.1, 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-tls13-example-pages - update to 2.4.51-35.69.1
apache2-event - addressed in versions 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-event-debuginfo - addressed in versions 2.4.51-150400.6.46.1, 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1, 2.4.66-150400.6.57.1
apache2-manual - update to 2.4.58-150600.5.35.1
apache2-prefork-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
apache2-worker-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
apache2-utils-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
apache2-event-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
httpd-core - update to 2.4.62-3
mod_lua - update to 2.4.62-3
httpd-doc - update to 2.4.62-3
httpd - update to 2.4.64-1.fc41

• https://downloads.apache.org/httpd/CHANGES_2.4
• https://lists.apache.org/thread/4m0spjgwshl473c2hhgm3nop2d5lvs9q

• Multiple vulnerabilities in Apache HTTP Server
• Ubuntu update for apache2
• cPanel EasyApache4 update for Apache HTTP Server
• SUSE update for apache2
• SUSE update for apache2
• SUSE update for apache2
• SUSE update for apache2
• SUSE update for apache2
• Ubuntu update for apache2
• Anolis OS update for httpd
• Red Hat Enterprise Linux 9 update for httpd
• Red Hat Enterprise Linux 9 update for httpd
• Red Hat Enterprise Linux 9 update for httpd
• Tenable Security Center update for third-party components
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for httpd
• Red Hat Enterprise Linux 7 update for httpd
• Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION update for httpd
• Red Hat Enterprise Linux 10 update for httpd
• Red Hat Enterprise Linux 8 update for the httpd:2.4 module
• openEuler 24.03 LTS SP2 update for httpd
• openEuler 24.03 LTS SP1 update for httpd
• openEuler 22.03 LTS SP4 update for httpd
• openEuler 22.03 LTS SP3 update for httpd
• openEuler 20.03 LTS SP4 update for httpd
• Red Hat Enterprise Linux 8 update for the httpd:2.4 module
• Red Hat Enterprise Linux 8 update for the httpd:2.4 module
• Anolis OS update for httpd:2.4 module
• openEuler 24.03 LTS update for httpd
• Fedora 41 update for httpd
• Red Hat Enterprise Linux 8 update for the httpd:2.4 module
• Multiple vulnerabilities in IBM Total Storage Service Console (TSSC) / TS4500 IMC
• Multiple vulnerabilities in IBM QRadar SIEM
• Anolis OS update for httpd
• Juniper Secure Analytics update for third-party components
• Ubuntu update for apache2
• Ubuntu update for apache2
• SUSE update for apache2