HIGH 7.5 Microsoft PoC

CVE-2025-53020

Apache HTTP Server: HTTP/2 DoS by Memory Increase

Microsoft Security Update 2025-Jul: Apache HTTP Server: HTTP/2 DoS by Memory Increase

Affected Products

cbl2 httpd 2.4.64-1 on CBL Mariner 2.0
azl3 httpd 2.4.64-1 on Azure Linux 3.0
cbl2 httpd 2.4.62-1 on CBL Mariner 2.0
azl3 httpd 2.4.62-1 on Azure Linux 3.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53020
https://nvd.nist.gov/vuln/detail/CVE-2025-53020

Published: 2025-07-08 · Source: Microsoft · Feed updated: 2026-08-04

This high severity vulnerability with a CVSS score of 7.5 was published on 2025-07-08 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. Affected: cbl2 httpd 2.4.64-1 on CBL Mariner 2.0, azl3 httpd 2.4.64-1 on Azure Linux 3.0, cbl2 httpd 2.4.62-1 on CBL Mariner 2.0 and 1 more.

vulnfeed aggregates 9166 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.