8.5

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

CVSS: 8.5v2.0HighKEVAnalyzed
Published 11-03-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-27059 is a high (CVSS 8.5) vulnerability in Microsoft Office. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 6.08% chance of exploitation in the next 30 days, higher than 93.3% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.5/10
010
High · v2.0 (NVD)
EPSS score
6.08%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-03-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Office Remote Code Execution Vulnerability
  3. 17-11-2021
    CISA remediation dueApply updates per vendor instructions.
  4. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Office Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

6.08%

Chance of exploitation in the next 30 days

Percentile

93%

Versus all other CVEs

30-day change

0.00 pp

From 6.08% on 18-09-2026

18-09-202618-10-2026
EPSS score
6.08%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
17-11-2021

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-27059

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft5 products

1 vendor · 5 products

References

3 links