Vulnerability · Published Jul 10, 2025 · Assigned by apache
CVE-2025-53020Apache HTTP Server: HTTP/2 DoS by Memory Increase
High 7.5
In plain English
A high-severity memory leak in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.0% (higher than 92% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)5.0%top 7.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:10 | mod_http2 | 2.0.29-4.el10_2 | ALSA-2026:22528 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4185+0955a0d7.5 | ALSA-2026:22140 |
| AlmaLinux:9 | mod_http2 | 2.0.26-6.el9_8 | ALSA-2026:22551 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 | ALSA-2026:22140 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8 | ALSA-2026:22140 |
| Alpine:v3.20 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-53020 |
| Alpine:v3.21 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-53020 |
| Alpine:v3.22 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-53020 |
| Alpine:v3.23 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-53020 |
| Alpine:v3.24 | apache2 | 2.4.64-r0 | ALPINE-CVE-2025-53020 |
| Debian:12 | apache2 | 2.4.65-1~deb12u1 | DEBIAN-CVE-2025-53020 |
| Debian:13 | apache2 | 2.4.64-1 | DEBIAN-CVE-2025-53020 |
| Debian:14 | apache2 | 2.4.64-1 | DEBIAN-CVE-2025-53020 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1938+3b7755d4.3 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1842+4a9649e8.2 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1840+b070a976.1 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40053+5a18018e.7 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40045+6ce8579b.6 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+2061+8d03fdec.5 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:22140 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1984+1bed3124.4 | RLSA-2026:22140 |
| Rocky Linux:10 | mod_http2 | 0:2.0.29-4.el10_2 | RLSA-2026:22528 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2026:22140 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:22140 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1883+38ed6c58.1 | RLSA-2026:22140 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1938+3b7755d4.3 | RLSA-2026:22140 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+2061+8d03fdec.4 | RLSA-2026:22140 |
| Rocky Linux:9 | mod_http2 | 0:2.0.26-6.el9_8 | RLSA-2026:22551 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.10.0+40053+5a18018e.2 | RLSA-2026:22140 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2026:22140 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.15 | UBUNTU-CVE-2025-53020 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.15 | USN-7639-1 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.7 | USN-7639-1 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.7 | UBUNTU-CVE-2025-53020 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.17 – through 2.4.63 |
Weakness: CWE-401 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H