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CVE-2025-53020: Late Release of Memory after Effective Lifetime Vulnerability in Apache HTTP Server

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Overview

CVE-2025-53020 represents a significant vulnerability in the Apache HTTP Server, affecting versions from 2.4.17 to 2.4.63. This vulnerability could potentially allow malicious actors to compromise systems or lead to data leakage. As Apache HTTP Server is widely used, the impact of this vulnerability is broad in scale, underscoring the urgency of addressing it in a timely manner.

Vulnerability Summary

CVE ID: CVE-2025-53020
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Apache HTTP Server | 2.4.17 to 2.4.63

How the Exploit Works

The vulnerability exists due to the improper handling of memory in Apache HTTP Server, specifically a late release of memory after its effective lifetime. This can allow an attacker to manipulate this released memory, executing arbitrary code which could lead to system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited. In this case, a malicious HTTP request is sent to the server, exploiting the vulnerability:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "exploit(memory_address)" }

Upon receipt of this request, the server may process it in a way that triggers the late release of memory, allowing the malicious payload to exploit this vulnerability.

Recommended Mitigation

Users are advised to upgrade to Apache HTTP Server version 2.4.64, which contains a fix for this vulnerability. As a temporary mitigation, users can apply a vendor patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS). However, these are temporary measures and users should plan to upgrade as soon as possible to ensure long-term security.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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