HIGH

CVE-2025-53020

CVSS v3

7.5

HIGH

EPSS Score

5.0 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

apacheBitnamifrom 2.4.17 · fixed in 2.4.64
httpdAlmaLinux:8all versions · fixed in 2.4.37-65.module_el8.10.0+4185+0955a0d7.8and 6 other packages
mod_http2AlmaLinux:10all versions · fixed in 2.0.29-4.el10_2
mod_http2AlmaLinux:9all versions · fixed in 2.0.26-6.el9_8
mod_http2AlmaLinux:8all versions · fixed in 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-65.module_el8.10.0+4185+0955a0d7.8and 1 other package

Vendor advisories

CVE-2025-53020 Red Hat Product Security335 products fixed
mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase
RHSA-2026:55992 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_http2 security update
RHSA-2026:55930 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_http2 security update
RHSA-2026:50572 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_http2 security update
RHSA-2026:50538 Red Hat Product Security5 products fixed
Red Hat Security Advisory: mod_http2 security update
RHSA-2026:36846 Red Hat Product Security50 products fixed
Red Hat Security Advisory: httpd:2.4 security update

7 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2025-07-10
Last Modified: 2025-11-04

Frequently asked questions

What is CVE-2025-53020?

Is CVE-2025-53020 actively exploited?

Active exploitation of CVE-2025-53020 has not been confirmed. Its EPSS score was 5.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-53020?

CVE-2025-53020 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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