8.8

CVE-2021-38666: microsoft remote desktop client for windows desktop

CVSS: 8.8v3.1HighModified
Published 10-11-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-38666 is a high (CVSS 8.8) vulnerability in microsoft remote desktop client for windows desktop. EPSS estimates a 15.18% chance of exploitation in the next 30 days, higher than 96.7% of scored vulnerabilities.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
15.18%
0%100%
Medium · +0.12 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-11-2021
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Remote Desktop Client Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

15.18%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

+0.12 pp

From 15.06% on 20-09-2026

20-09-202620-10-2026
EPSS score
15.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft31 products

1 vendor · 31 products

References

2 links