# CVE-2021-27059: Microsoft Office Remote Code Execution Vulnerability

Source: https://junglewise.ai/threats/cve-2021-27059-microsoft-office-remote-code-execution-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-27059 · Severity: critical · CVSS 7.6 · Exploited in the wild · Published 2021-11-03

Microsoft Office contains an unspecified vulnerability that allows for remote code execution. The flaw requires high privileges and user interaction, but can lead to a full compromise of confidentiality, integrity, and availability.

Technologies: [Microsoft Office](https://junglewise.ai/threats/technologies/office). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2021-27059 exploited in the wild?** Yes. CVE-2021-27059 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-27059?** Critical severity, with a CVSS score of 7.6, published 3 November 2021.

**Which products and versions are affected?** Microsoft Office 2010 Service Pack 2; Microsoft Office 2013 Service Pack 1; Microsoft Office 2016 All versions.

**Is there a fix for CVE-2021-27059?** 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-2021-27059 attacked?** It is attacked over the network or with local access, in a network appliance.

**Am I affected by CVE-2021-27059?** Check whether you run Microsoft Office. 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.

## Affected products

- Microsoft Office 2010 Service Pack 2
- Microsoft Office 2013 Service Pack 1
- Microsoft Office 2016 All versions

## Timeline

- 2021-03-11: disclosed: NVD Published Date
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: exploited: Reported as exploited in the wild per CISA KEV entry date.

## Related threats

- [Microsoft Office Outlook user warning spoofing vulnerability](https://junglewise.ai/threats/cve-2026-124194-microsoft-office-outlook-missing-user-interaction-for)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-122198-heap-based-buffer-overflow-in-microsoft-office-allows-an)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-120003-heap-based-buffer-overflow-in-microsoft-office-allows-an)
- [Microsoft Office UI security feature bypass](https://junglewise.ai/threats/cve-2026-119998-product-ui-does-not-warn-user-of-unsafe-actions-in-microsoft)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-116717-heap-based-buffer-overflow-in-microsoft-office-allows-an)