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Microsoft IIS Exploit Allows Unauthenticated Attackers to Run Arbitrary Code

## Cybersecurity Update: Microsoft IIS Vulnerability

BBy Ben EmersonOct 15, 20252 min read

Cybersecurity Update: Microsoft IIS Vulnerability

A critical security vulnerability has been identified in Microsoft Internet Information Services (IIS), allowing attackers to execute arbitrary code without authentication. This flaw affects the IIS Inbox COM Objects due to improper handling of shared memory and objects that have been freed.

On October 14, 2025, Microsoft disclosed a remote code execution vulnerability in the IIS Inbox COM Objects, tracked as CVE-2025-59282 and rated "Important." The vulnerability arises from a race condition and a use-after-free error, enabling attackers to execute code within the IIS process context without requiring authentication.

Microsoft, as the CVE Numbering Authority, has provided detailed information and a security bulletin with recommended updates and mitigation steps. Administrators are advised to apply the patches immediately to prevent potential system compromises.

The root cause of CVE-2025-59282 involves two specific weaknesses:

CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization) CWE-416 (Use After Free)

This flaw affects the IIS Inbox COM Objects due to improper handling of shared memory and objects that have been freed.
Ben Emerson · Thehackingpost

These weaknesses occur within the IIS Inbox COM Objects, which handle global memory operations. Attackers can exploit these vulnerabilities by sending specially crafted requests that manipulate object creation and deletion timing, leading to the execution of malicious code.

Microsoft's CVSS 3.1 assessment assigns a base score of 7.0 and a temporal score of 6.1, indicating high impact metrics with full loss of confidentiality, integrity, and availability if exploited.

Administrators should promptly download the security update from Microsoft's official site to address the race condition and use-after-free error. Until the patch is applied, it is advisable to limit network access to port 80 and port 443 to trusted hosts only, reducing exposure. Monitoring logs for unusual IIS activity is also recommended to detect potential exploitation attempts.

CVE Vulnerability Released Assigning CNA Impact

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CVE-2025-59282 Internet Information Services (IIS) Inbox COM Objects (Global Memory) RCE Oct 14, 2025 Microsoft Remote Code Execution

Running web servers with minimum required privileges can mitigate potential damage if code execution is attempted. Organizations are encouraged to swiftly apply the update and enhance network controls to protect their IIS servers from this vulnerability.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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