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Findings

CVE-2021-27059

Microsoft Office Remote Code Execution Vulnerability

Published Mar 11, 2021 · corrected/updated Aug 19, 2026 · microsoft office · evidence confidence very high

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

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2021-27059 is a high public vulnerability record for microsoft office. CISA lists it as known exploited. Published remediation guidance: Apply updates per vendor instructions. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether microsoft office is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: microsoft/office (2010); microsoft/office (2013); microsoft/office 2016; Microsoft Office. Published remediation guidance: Apply updates per vendor instructions. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.6, EPSS 6.1%. CISA lists it as known exploited. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since Nov 3, 2021. Listed in the CISA Known Exploited Vulnerabilities catalog.

  • Patch and remediation

    Apply updates per vendor instructions. CISA due date Nov 17, 2021.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

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.

Affected

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

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

References