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Vulnerabilities

Vulnerability · CVE-2021-27059

Microsoft Office Remote Code Execution Vulnerability

Published Mar 11, 2021 · catalog updated Aug 19, 2026 · Microsoft Office

Patch now

CVE-2021-27059 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Microsoft Office against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.6
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
6.08%
Remediation
Remediation guidance
Affected products
cpe microsoft/office · cpe microsoft/office 2016 · vendor Microsoft Office

Microsoft Office contains an unspecified vulnerability that allows for remote code execution.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/office2010
  • cpe microsoft/office2013
  • cpe microsoft/office 2016version unspecified
  • vendor Microsoft Officeversion unspecified

How to fix CVE-2021-27059

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-27059 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Microsoft Office against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 2010, 2013. Apply updates per vendor instructions.

What should an analyst verify?

No weakness class is stored. EPSS 6.08%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 11, 2021 · Catalog

    Detected

    Microsoft Office contains an unspecified vulnerability that allows for remote code execution.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Aug 19, 2026 · Catalog

    Updated

    Microsoft Office contains an unspecified vulnerability that allows for remote code execution.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-27059

    Microsoft Office contains an unspecified vulnerability that allows for remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-27059

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-27059

    30-day exploitation probability 6.1%

    first.org
  • NIST NVDVulnerability recordCVE-2021-27059

    Microsoft Office Remote Code Execution Vulnerability

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-27059

    Microsoft Office contains an unspecified vulnerability that allows for remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.