OnlyFm252
Windows RDP Client

CVE-2021-31186 — Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability

Important CVSS 7.4 EPSS 0.02966 2021-05 archive

Executive Summary

None

Overview

7.4
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Information Disclosure
Released May 11 2021
Last Updated May 11 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.02966 — 0.85456 percentile
NVD CVSS 7.4 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.4

EPSS Score

0.02966
probability of exploitation in the next 30 days
0.85456 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

26 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5003172 (Security Update) Important Information Disclosure Yes
Windows 10 for x64-based Systems 5003172 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1607 for 32-bit Systems 5003197 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1607 for x64-based Systems 5003197 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1803 for 32-bit Systems 5003174 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1803 for ARM64-based Systems 5003174 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1803 for x64-based Systems 5003174 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for 32-bit Systems 5003171 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for ARM64-based Systems 5003171 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for x64-based Systems 5003171 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for 32-bit Systems 5003169 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for ARM64-based Systems 5003169 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for x64-based Systems 5003169 (Security Update) Important Information Disclosure Yes
Windows 10 Version 2004 for 32-bit Systems 5003173 (Security Update) Important Information Disclosure Yes
Windows 10 Version 2004 for ARM64-based Systems 5003173 (Security Update) Important Information Disclosure Yes
Windows 10 Version 2004 for x64-based Systems 5003173 (Security Update) Important Information Disclosure Yes
Windows 10 Version 20H2 for 32-bit Systems 5003173 (Security Update) Important Information Disclosure Yes
Windows 10 Version 20H2 for ARM64-based Systems 5003173 (Security Update) Important Information Disclosure Yes
Windows 7 for 32-bit Systems Service Pack 1 5003233 (Monthly Rollup) 5003228 (Security Only) Important Information Disclosure 5001335 5001392 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.24597 6.1.7601.24598 Yes 5003233 5003228 Windows 7 for x64-based Systems Service Pack 1 5003233 (Monthly Rollup) 5003228 (Security Only) Important Information Disclosure 5001335 5001392 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.24597 6.1.7601.24598 Yes 5003233 5003228 Windows 8.1 for 32-bit systems 5003209 (Monthly Rollup) 5003220 (Security Only) Important Information Disclosure 5001382 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.20017 Yes 5003209 5003220 Windows 8.1 for x64-based systems 5003209 (Monthly Rollup) 5003220 (Security Only) Important Information Disclosure 5001382 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.20017 Yes 5003209 5003220 Windows RT 8.1 5003209 (Monthly Rollup) Important Information Disclosure Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5003210 (Monthly Rollup) 5003225 (Security Only) Important Information Disclosure 5001389 5001332 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.21117 Yes 5003210 5003225 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5003210 (Monthly Rollup) 5003225 (Security Only) Important Information Disclosure 5001389 5001332 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.21117 Yes 5003210 5003225 Windows Server 2008 for x64-based Systems Service Pack 2 5003210 (Monthly Rollup) 5003225 (Security Only) Important Information Disclosure 5001389 5001332 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.21117 Yes 5003210 5003225 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5003210 (Monthly Rollup) 5003225 (Security Only) Important Information Disclosure 5001389 5001332 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.21117 Yes 5003210 5003225 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5003233 (Monthly Rollup) 5003228 (Security Only) Important Information Disclosure 5001335 5001392 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.24597 6.1.7601.24598 Yes 5003233 5003228 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5003233 (Monthly Rollup) 5003228 (Security Only) Important Information Disclosure 5001335 5001392 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.24597 6.1.7601.24598 Yes 5003233 5003228 Windows Server 2012 5003208 (Monthly Rollup) 5003203 (Security Only) Important Information Disclosure 5001387 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.2.9200.23347 Yes 5003208 5003203 Windows Server 2012 (Server Core installation) 5003208 (Monthly Rollup) 5003203 (Security Only) Important Information Disclosure 5001387 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.2.9200.23347 Yes 5003208 5003203 Windows Server 2012 R2 5003209 (Monthly Rollup) 5003220 (Security Only) Important Information Disclosure 5001382 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.20017 Yes 5003209 5003220 Windows Server 2012 R2 (Server Core installation) 5003209 (Monthly Rollup) 5003220 (Security Only) Important Information Disclosure 5001382 5001383 Base: 7.4 Temporal: 6.4 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.20017 Yes 5003209 5003220 Windows Server 2016 5003197 (Security Update) Important Information Disclosure Yes
Windows Server 2016 (Server Core installation) 5003197 (Security Update) Important Information Disclosure Yes
Windows Server 2019 5003171 (Security Update) Important Information Disclosure Yes
Windows Server 2019 (Server Core installation) 5003171 (Security Update) Important Information Disclosure Yes
Windows Server, version 1909 (Server Core installation) 5003169 (Security Update) Important Information Disclosure Yes
Windows Server, version 2004 (Server Core installation) 5003173 (Security Update) Important Information Disclosure Yes
Windows Server, version 20H2 (Server Core Installation) 5003173 (Security Update) Important Information Disclosure Yes

Patches

7 patches
Article Type Restart
5003172 Security Update Yes
5003197 Security Update Yes
5003174 Security Update Yes
5003171 Security Update Yes
5003169 Security Update Yes
5003173 Security Update Yes
5003209 Monthly Rollup Yes

Known Exploits

Acknowledgments

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