CVE-2025-53020

HIGH

Apache HTTP Server 2.4.17-2.4.63 - Use-After-Free

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2025-53020. PoCs published by galbarnahum.

AI-analyzed exploit summary This repository contains a functional Python-based proof-of-concept exploit for CVE-2025-53020, a memory exhaustion vulnerability in Apache httpd's HTTP/2 implementation. The exploit leverages HPACK header compression to exhaust server memory by sending crafted HTTP/2 requests with repeated header names.

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.

Exploits (1)

nomisec WORKING POC 1 stars
by galbarnahum · poc
https://github.com/galbarnahum/CVE-2025-53020-PoC

This repository contains a functional Python-based proof-of-concept exploit for CVE-2025-53020, a memory exhaustion vulnerability in Apache httpd's HTTP/2 implementation. The exploit leverages HPACK header compression to exhaust server memory by sending crafted HTTP/2 requests with repeated header names.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Apache httpd (HTTP/2 implementation)
No auth needed
Prerequisites: Python 3.7+ · h2 library · tqdm library · network access to target
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0332
EPSS Percentile 87.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-401
Status published
Products (1)
apache/http_server 2.4.17 - 2.4.64
Published Jul 10, 2025
Tracked Since Feb 18, 2026