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CVE-2025-53805: Critical Out-of-Bounds Read Vulnerability in Windows Internet Information Services (IIS)

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a critical vulnerability, CVE-2025-53805, affecting Windows Internet Information Services (IIS). This vulnerability, an out-of-bounds read error, allows unauthorized attackers to deny service over a network, potentially leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-53805
Severity: Critical, with a CVSS Score of 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise, and possible data leakage

Affected Products

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Product | Affected Versions

Microsoft Windows Server | 2019, 2022
Internet Information Services (IIS) | 10.0, 10.1

How the Exploit Works

The vulnerability exists due to an out-of-bounds read error within the Windows IIS. An attacker can send specially crafted packets to the server to trigger this vulnerability. Once triggered, the system may crash, resulting in a denial of service. In worst-case scenarios, the attacker may leverage this error to execute arbitrary code in the system or cause data leakage.

Conceptual Example Code

Below is a conceptual example of how an attacker might exploit this vulnerability. The attacker sends a malicious HTTP request to the targeted server:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"malicious_payload": "Out-of-bounds data that triggers the vulnerability"
}

Mitigation Guidance

To mitigate this vulnerability, apply the latest patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation by blocking the malicious packets. Regularly update your systems and software to the latest version to prevent such vulnerabilities.

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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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