Overview

CVE-2025-54906 is a significant vulnerability that affects Microsoft Office, a widely used productivity suite. This vulnerability arises from flawed memory management, specifically the freeing of memory not on the heap, which potentially allows an unauthorized attacker to execute code locally. Due to the broad usage of Microsoft Office, this vulnerability could have a substantial impact on organizations across the globe, highlighting the necessity for immediate attention and mitigation.

Vulnerability Summary

CVE ID: CVE-2025-54906
Severity: High (CVSS: 7.8)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Microsoft Office | All versions prior to the vendor patch

How the Exploit Works

The vulnerability lies in the incorrect handling of memory not on the heap within Microsoft Office. An attacker could craft a malicious file that, when opened in Microsoft Office, triggers the flaw and allows the attacker to execute arbitrary code on the victim’s system. This code execution occurs in the context of the current user.

Conceptual Example Code

This is a conceptual example, representing how a malicious payload might be embedded in a Microsoft Office file to exploit this vulnerability:

<doc>
<element attribute="exp">
<![CDATA[
function exploit() {
var malicious_code = "Base64 encoded malicious code";
var vulnerable_memory = freeHeapMemory();
vulnerable_memory.execute(malicious_code);
}
exploit();
]]>
</element>
</doc>

In this hypothetical example, the malicious code is embedded within a function that is called when the document is opened. The `freeHeapMemory` function call triggers the vulnerability, allowing the execution of the malicious code as the current user.