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.