Overview
This report explores CVE-2025-30397, a significant vulnerability affecting the Microsoft Scripting Engine. This flaw, characterized by access of a resource using an incompatible type (‘type confusion’), could allow an unauthorized attacker to execute code over a network. This vulnerability is of particular concern to network administrators and organizations using Microsoft products, as its exploitation can potentially lead to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-30397
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized code execution, potential system compromise, and data leakage
Affected Products
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Product | Affected Versions
Microsoft Scripting Engine | All versions prior to the patch
How the Exploit Works
This exploitation leverages a ‘type confusion’ vulnerability in the Microsoft Scripting Engine. The flaw occurs when the system accesses a resource using an incompatible type, disrupting the normal flow of data and potentially leading to unintended behavior. In this case, an attacker can manipulate this behavior to execute arbitrary code over a network without any user interaction or privilege requirement, leading to potential system compromise or data leakage.
Conceptual Example Code
Here is a conceptual example of how this vulnerability might be exploited:
POST /exploit/cve-2025-30397 HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"type_confusion_payload": "arbitrary_code_to_execute"
}In this example, the attacker sends a malicious payload `arbitrary_code_to_execute` through an HTTP POST request. This payload triggers the ‘type confusion’ vulnerability in the Microsoft Scripting Engine, potentially leading to unauthorized code execution.
Mitigation Guidance
To mitigate this vulnerability, organizations are advised to apply the vendor-provided patch as soon as possible. If immediate patching is not feasible, temporary mitigation measures such as using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be employed.
