CVE-2025-54906: 
vulnerability analysis and mitigation

CVE-2025-54906 is a Remote Code Execution (RCE) vulnerability in Microsoft Office that occurs due to freeing memory not on the heap. The vulnerability was disclosed as part of Microsoft's September 2025 Patch Tuesday updates and is rated as Important severity (GBHackers, BleepingComputer).

The vulnerability allows an attacker to execute arbitrary code locally through improper memory management when freeing memory not allocated on the heap in Microsoft Office. It received a severity rating of Important rather than Critical, suggesting some mitigating factors limit its exploitability (CyberSecurityNews, GBHackers).

If successfully exploited, this vulnerability could allow an attacker to execute malicious code in the context of the current user. Since it requires local code execution, the attacker would need prior access to the target system or to convince a user to open a specially crafted file (BleepingComputer).

Microsoft has released patches to address this vulnerability as part of the September 2025 Patch Tuesday updates. Users and administrators are strongly advised to apply the security updates promptly through Windows Update or by downloading them directly from the Microsoft Update Catalog (BleepingComputer).