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CVE-2021-27059

Microsoft Office Remote Code Execution Vulnerability

HIGH
7.6
CVSS Score
Published: March 11, 2021 at 03:49 PM UTC
Updated: August 19, 2026 at 07:35 PM UTC
5 products affected across 1 vendorOfficeExcelOffice 2016

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Severity
HIGH7.6
Exploitation
CISA KEV
Exploit prediction
EPSS 6%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score6.1%

EPSS (Exploit Prediction Scoring System) estimates a 6.1% chance this CVE is exploited in the wild within the next 30 days — higher than 93% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Nov 3, 2021
Remediation Due
Nov 17, 2021
1804 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-27059

Description

Microsoft Office Remote Code Execution Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Excel· Microsoft
95%
13.0.0.0 ≤ v < 14.0.7266.5000
Affected range stops below 14.0.7266.5000, so it looks safe — our inference, not a vendor statement
Office· Microsoft
95%
2010 sp22013 sp1
Office 2016· Microsoft
95%
16.0.0 ≤ v < 16.0.5134.100016.0.0
Affected range stops below 16.0.5134.1000, so it looks safe — our inference, not a vendor statement
Office 2010· Microsoft
60%
13.0.0.0 ≤ v < 14.0.7266.500013.0.0.0
Affected range stops below 14.0.7266.5000, so it looks safe — our inference, not a vendor statement
Office 2013· Microsoft
60%
15.0.0 ≤ v < publication15.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

PatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27059
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27059
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27059

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.6HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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