Resource management error in Apache HTTP Server - CVE-2025-53020

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Main Vulnerability Database Vulnerabilities #VU112727

Resource management error in Apache HTTP Server - CVE-2025-53020

Published: July 10, 2025 / Updated: July 10, 2025


Vulnerability identifier: #VU112727
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-53020
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the server when handling HTTP/2 requests. A remote attacker can send multiple requests to the server and perform a denial of service (DoS) attack.


Affected software

Apache HTTP Server
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Gentoo Linux
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 Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Enterprise Storage
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Server Applications Module
Basesystem Module
SUSE Package Hub 15
openSUSE Leap
Ubuntu
Fedora
SecurityCenter
EasyApache
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
mod_http2
http2 (Red Hat package)
mod_md
apache2 (Ubuntu package)
httpd
httpd-devel
httpd-tools
mod_ldap
mod_proxy_html
mod_session
mod_ssl
httpd-filesystem
httpd-manual
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-tls13-example-pages
apache2-worker
apache2-tls13-prefork
apache2-devel
apache2
apache2-tls13
apache2-tls13-utils-debuginfo
apache2-example-pages
apache2-tls13-doc
apache2-doc
apache2-utils-debuginfo
apache2-event-debuginfo
apache2-event
apache2-worker-debugsource
apache2-prefork-debugsource
apache2-manual
apache2-utils-debugsource
apache2-event-debugsource
httpd-doc
mod_lua
httpd-core
www-servers/apache

How to mitigate CVE-2025-53020

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
mod_http2 - update to 1.15.7-10
http2 (Red Hat package) - addressed in versions 1.15.19-4.el9_2.8, 2.0.26-2.el9_4.3, 2.0.26-4.el9_6.2, 2.0.29-2.el10_0.2
mod_md - update to 2.0.8-8
apache2 (Ubuntu package) - addressed in versions 2.4.18-2ubuntu3.17+esm16, 2.4.29-1ubuntu4.27+esm6, 2.4.41-4ubuntu3.23+esm2, 2.4.52-1ubuntu4.15, 2.4.58-1ubuntu8.7, 2.4.63-1ubuntu1.1
httpd - addressed in versions 2.4.37-655.0.1, 2.4.64-1
httpd-devel - addressed in versions 2.4.37-655.0.1, 2.4.64-1
httpd-tools - addressed in versions 2.4.37-655.0.1, 2.4.64-1
mod_ldap - addressed in versions 2.4.37-655.0.1, 2.4.64-1
mod_proxy_html - addressed in versions 2.4.37-655.0.1, 2.4.64-1
mod_session - addressed in versions 2.4.37-655.0.1, 2.4.64-1
mod_ssl - addressed in versions 2.4.37-655.0.1, 2.4.64-1
httpd-filesystem - addressed in versions 2.4.37-655.0.1, 2.4.64-1
httpd-manual - addressed in versions 2.4.37-655.0.1, 2.4.64-1
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-tls13-example-pages - 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-tls13-prefork - update to 2.4.51-35.69.1
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 - 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 - update to 2.4.51-35.69.1
apache2-tls13-utils-debuginfo - 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-doc - update to 2.4.51-35.69.1
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-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-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-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-worker-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
apache2-prefork-debugsource - addressed in versions 2.4.58-150600.5.35.1, 2.4.62-150700.4.3.1
apache2-manual - update to 2.4.58-150600.5.35.1
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-doc - update to 2.4.64-1
mod_lua - update to 2.4.64-1
httpd-core - update to 2.4.64-1
httpd - addressed in versions 2.4.64-1.fc41, 2.4.64-1.fc42
www-servers/apache - update to 2.4.68

External References

Related Security Bulletins