CVE-2025-53020

Apache HTTP Server: HTTP/2 DoS by Memory Increase

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

Apache Software Foundation · Apache HTTP Server

CVSS v3.1 CNA

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

EPSS

4.96% chance of exploitation in the next 30 days, 92nd percentile

Published

2025-07-10

Updated

2025-11-04

Proof-of-concept exploits (1)

• galbarnahum/CVE-2025-53020-PoC2★ · 2026-01-12

Security advisories

• https://httpd.apache.org/security/vulnerabilities_24.html

References

• CVE Record
• NVD entry