CVE-2025-62557: Microsoft Office use after free local code execution

CVE-2025-62557 · Severity: high · CVSS 8.4 · Published 2025-12-09

A vulnerability in Microsoft Office could allow an attacker to run malicious code on a user's computer. Microsoft Office is a widely used suite of productivity applications including Word, Excel, and PowerPoint. If exploited, this flaw could allow an unauthorized person to gain full control over the affected system, potentially leading to data theft or further network compromise.

Technologies: Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2019, Microsoft Office for Android, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024. Vendors: Microsoft.

Quick answers

Is CVE-2025-62557 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-62557 being exploited in the wild.
How severe is CVE-2025-62557?
High severity, with a CVSS score of 8.4, published 9 December 2025.
Which products and versions are affected?
Microsoft 365 Apps for Enterprise x86 and x64 editions; Microsoft Office 2016 x86 and x64 editions; Microsoft Office 2019 x86 and x64 editions; Microsoft Office LTSC 2021 Windows and macOS; and 1 more.
Is there a fix for CVE-2025-62557?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2025-62557 attacked?
It is attacked with local access, in a network appliance.
Am I affected by CVE-2025-62557?
Check whether you run Microsoft 365 Apps for Enterprise, Microsoft 365 Copilot for Android, Microsoft Office 2016 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A use-after-free (UAF) vulnerability exists in Microsoft Office (CWE-416). The flaw is triggered when the application continues to use a pointer after it has been freed, leading to memory corruption. An attacker with local access to the system can exploit this to execute arbitrary code with the privileges of the logged-in user. The vulnerability affects multiple versions of Office across Windows, macOS, and Android, including Office 2016, 2019, LTSC 2021/2024, and Microsoft 365 Apps. Microsoft has released security updates to address this issue.

Affected products

  • Microsoft Office 2016 x86 and x64 editions
  • Microsoft Office 2019 x86 and x64 editions
  • Microsoft Office LTSC 2021 Windows and macOS
  • Microsoft Office LTSC 2024 Windows and macOS
  • Microsoft 365 Apps for Enterprise x86 and x64 editions
  • Microsoft Office for Android
  • Microsoft 365 Copilot for Android

Timeline

  • 2025-12-09: disclosed: Initial disclosure by Microsoft
  • 2025-12-09: advisory: Microsoft Security Update Guide published

References

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