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CVE-2025-53020

HighPublished

Apache HTTP Server: HTTP/2 DoS by Memory Increase

Published: Jul 10, 2025
Updated: Nov 4, 2025
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

4.8%

Low · next 30 days

Percentile: 91.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2025-53020-PoCPoC
PoC for CVE-2025-53020 - HPACK bombing for Apache HTTPD.

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