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Fencer Vulns
high 7.5

CVE-2025-53020 json

Apache HTTP Server: HTTP/2 DoS by Memory Increase

published 2025-07-10 15 mo ago modified 2026-09-08 2 mo ago also BIT-apache-2025-53020 , EUVD-2025-21015

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server.

This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63.

Users are recommended to upgrade to version 2.4.64, which fixes the issue.

Patch / fix

  • bitnami apache 2.4.64
  • apache http_server 2.4.64
  • apache2 Debian 12 2.4.65-1~deb12u1
  • apache2 Debian 14, Debian 13 2.4.64-1

debian advisories DEBIAN-CVE-2025-53020

  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.15
  • apache2 Ubuntu 24.04 LTS 2.4.58-1ubuntu8.7
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm16
  • apache2 Ubuntu Pro 18.04 LTS 2.4.29-1ubuntu4.27+esm6
  • apache2 Ubuntu Pro 20.04 LTS 2.4.41-4ubuntu3.23+esm2

ubuntu advisories UBUNTU-CVE-2025-53020

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-httpd jboss core services 1 2.4.62-13.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.62-13.el8jbcs
  • jbcs-httpd24-mod_md jboss core services 1 1:2.4.28-16.el7jbcs
  • jbcs-httpd24-mod_md jboss core services 1 1:2.4.28-16.el8jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.62-13.el7jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.62-13.el8jbcs
  • jbcs-httpd24-nghttp2 jboss core services 1 1.64.0-3.el7jbcs
  • jbcs-httpd24-nghttp2 jboss core services 1 1.64.0-3.el8jbcs

red hat advisories RHSA-2026:55992RHSA-2026:55930RHSA-2026:50538RHSA-2026:50572RHSA-2026:36846RHSA-2026:36831

  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
  • apache2 SLE Module for Basesystem 15 SP7 2.4.62-150700.4.3.1
  • apache2-event SLE Module for Package Hub 15 SP7 2.4.62-150700.4.3.1
  • apache2-utils SLE Module for Server Applications 15 SP7 2.4.62-150700.4.3.1
  • apache2-worker SLE Module for Server Applications 15 SP7 2.4.62-150700.4.3.1
  • apache2-prefork SLE Module for Basesystem 15 SP7 2.4.62-150700.4.3.1
  • apache2 SLE Module for Package Hub 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 2.4.58-150600.5.35.1
  • apache2-event SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 2.4.58-150600.5.35.1

suse advisories SUSE-SU-2026:2686-1SUSE-SU-2025:02685-1SUSE-SU-2025:02684-1SUSE-SU-2025:02683-1SUSE-SU-2025:02682-1SUSE-SU-2025:02565-1

  • apache2 openSUSE Tumbleweed 2.4.64-1.1

opensuse advisories openSUSE-SU-2025:15360-1

  • mod_http2 AlmaLinux 10 2.0.29-4.el10_2
  • mod_http2 AlmaLinux 9 2.0.26-6.el9_8
  • httpd AlmaLinux 8 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
  • mod_ssl AlmaLinux 8 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_ldap AlmaLinux 8 2.4.37-65.module_el8.10.0+4185+0955a0d7.8
  • mod_http2 AlmaLinux 8 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
  • httpd-tools AlmaLinux 8 2.4.37-65.module_el8.10.0+4185+0955a0d7.8

almalinux advisories ALSA-2026:22528ALSA-2026:22551ALSA-2026:22140

  • mod_http2 Rocky Linux 10 2.0.29-4.el10_2
  • mod_http2 Rocky Linux 9 2.0.26-6.el9_8
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+2061+8d03fdec.5
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1830+22f0c9e0
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1938+3b7755d4.3
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1984+1bed3124.4
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1842+4a9649e8.2
  • httpd Rocky Linux 8 2.4.37-65.module+el8.10.0+1840+b070a976.1

rocky linux advisories RLSA-2026:22528RLSA-2026:22551RLSA-2026:22140

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 2.4.64-r0

alpine advisories ALPINE-CVE-2025-53020

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd CBL-Mariner 2.0, Azure Linux 3.0 2.4.64-1

azure linux advisories AZL-65094AZL-65109

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-53020 updated cvss 5.3

mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase

  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.10.0+23815+1b5e1c66.2, httpd 2.4.37-65.module+el8.10.0+24281+ea10630c.8, mod_ssl 2.4.37-65.module+el8.10.0+24281+ea10630c.8, mod_ldap 2.4.37-65.module+el8.10.0+24281+ea10630c.8, mod_http2 1.15.7-10.module+el8.10.0+24315+35fe59d0.5, httpd-tools 2.4.37-65.module+el8.10.0+24281+ea10630c.8, +4 more
    fixed: vendor fix RHSA-2026:22140
  • Red Hat Enterprise Linux AppStream (v. 9) mod_http2 2.0.26-6.el9_8
    fixed: vendor fix RHSA-2026:22551
  • Red Hat Enterprise Linux AppStream (v. 10) mod_http2 2.0.29-4.el10_2
    fixed: vendor fix RHSA-2026:22528
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) mod_md 2.0.8-8.module+el8.4.0+23842+00253415.1, httpd 2.4.37-39.module+el8.4.0+24495+1afced82.12, mod_http2 1.15.7-3.module+el8.4.0+24495+1afced82.5, mod_ssl 2.4.37-39.module+el8.4.0+24495+1afced82.12, mod_ldap 2.4.37-39.module+el8.4.0+24495+1afced82.12, httpd-tools 2.4.37-39.module+el8.4.0+24495+1afced82.12, +4 more
    fixed: vendor fix RHSA-2026:36846
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) mod_md 2.0.8-8.module+el8.6.0+23843+c27a5dc4.1, httpd 2.4.37-47.module+el8.6.0+24496+af8fe930.13, mod_http2 1.15.7-5.module+el8.6.0+24496+af8fe930.5, mod_ssl 2.4.37-47.module+el8.6.0+24496+af8fe930.13, mod_ldap 2.4.37-47.module+el8.6.0+24496+af8fe930.13, httpd-tools 2.4.37-47.module+el8.6.0+24496+af8fe930.13, +4 more
    fixed: vendor fix RHSA-2026:36831
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) mod_md 2.0.8-8.module+el8.8.0+23840+d7e7db80.1, httpd 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, mod_http2 1.15.7-8.module+el8.8.0+24497+e470c0e2.7, mod_ssl 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, mod_ldap 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, httpd-tools 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, +4 more
    fixed: vendor fix RHSA-2026:36373
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_http2 1.15.19-4.el9_2.8
    fixed: vendor fix RHSA-2026:55930
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) mod_http2 2.0.26-2.el9_4.3
    fixed: vendor fix RHSA-2026:55992
show 8 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) mod_http2 2.0.29-2.el10_0.2
    fixed: vendor fix RHSA-2026:50538
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) mod_http2 2.0.26-4.el9_6.2
    fixed: vendor fix RHSA-2026:50572
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) mod_md 2.0.8-8.module+el8.4.0+23842+00253415.1, httpd 2.4.37-39.module+el8.4.0+24495+1afced82.12, mod_http2 1.15.7-3.module+el8.4.0+24495+1afced82.5, mod_ssl 2.4.37-39.module+el8.4.0+24495+1afced82.12, mod_ldap 2.4.37-39.module+el8.4.0+24495+1afced82.12, httpd-tools 2.4.37-39.module+el8.4.0+24495+1afced82.12, +4 more
    fixed: vendor fix RHSA-2026:36846
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) mod_md 2.0.8-8.module+el8.6.0+23843+c27a5dc4.1, httpd 2.4.37-47.module+el8.6.0+24496+af8fe930.13, mod_http2 1.15.7-5.module+el8.6.0+24496+af8fe930.5, mod_ssl 2.4.37-47.module+el8.6.0+24496+af8fe930.13, mod_ldap 2.4.37-47.module+el8.6.0+24496+af8fe930.13, httpd-tools 2.4.37-47.module+el8.6.0+24496+af8fe930.13, +4 more
    fixed: vendor fix RHSA-2026:36831
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) mod_md 2.0.8-8.module+el8.8.0+23840+d7e7db80.1, httpd 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, mod_http2 1.15.7-8.module+el8.8.0+24497+e470c0e2.7, mod_ssl 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, mod_ldap 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, httpd-tools 2.4.37-56.module+el8.8.0+24497+e470c0e2.12, +4 more
    fixed: vendor fix RHSA-2026:36373
  • Red Hat JBoss Core Services 2.4.62.SP4
    fixed: vendor fix RHSA-2026:27201
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.62-13.el7jbcs, jbcs-httpd24-mod_ssl 2.4.62-13.el7jbcs, jbcs-httpd24-mod_ldap 2.4.62-13.el7jbcs, jbcs-httpd24-mod_http2 2.0.29-10.el7jbcs, jbcs-httpd24-httpd-tools 2.4.62-13.el7jbcs, jbcs-httpd24-mod_session 2.4.62-13.el7jbcs, +3 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.62-13.el8jbcs, jbcs-httpd24-mod_ssl 2.4.62-13.el8jbcs, jbcs-httpd24-mod_ldap 2.4.62-13.el8jbcs, jbcs-httpd24-mod_http2 2.0.29-10.el8jbcs, jbcs-httpd24-httpd-tools 2.4.62-13.el8jbcs, jbcs-httpd24-mod_session 2.4.62-13.el8jbcs, +3 more
    fixed: vendor fix RHSA-2026:27200
  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_http2-debuginfo 1.15.19-4.el9_2.8, mod_http2-debugsource 1.15.19-4.el9_2.8 Red Hat Enterprise Linux AppStream E4S (v.9.4) mod_http2-debuginfo 2.0.26-2.el9_4.3, mod_http2-debugsource 2.0.26-2.el9_4.3 Red Hat Enterprise Linux AppStream EUS (v. 10.0) mod_http2-debuginfo 2.0.29-2.el10_0.2, mod_http2-debugsource 2.0.29-2.el10_0.2 Red Hat Enterprise Linux AppStream EUS (v.9.6) mod_http2-debuginfo 2.0.26-4.el9_6.2, mod_http2-debugsource 2.0.26-4.el9_6.2
    +2 more products
    Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-mod_md 2.4.28-16.el7jbcs, jbcs-httpd24-nghttp2 1.64.0-3.el7jbcs, jbcs-httpd24-mod_security 2.9.6-16.el7jbcs, jbcs-httpd24-mod_jk 1.2.50-14.redhat_1.el7jbcs, jbcs-httpd24-mod_proxy_cluster 1.3.22-9.el7jbcs, jbcs-httpd24-mod_jk-ap24 1.2.50-14.redhat_1.el7jbcs Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-mod_md 2.4.28-16.el8jbcs, jbcs-httpd24-nghttp2 1.64.0-3.el8jbcs, jbcs-httpd24-mod_security 2.9.6-16.el8jbcs, jbcs-httpd24-mod_jk 1.2.50-14.redhat_1.el8jbcs, jbcs-httpd24-mod_proxy_cluster 1.3.22-9.el8jbcs, jbcs-httpd24-mod_jk-ap24 1.2.50-14.redhat_1.el8jbcs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
15 mo ago

Exploit prediction

4.96% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.17, <2.4.64
2.4.64

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.