Windows Remote Desktop
CVE-2021-1674 — Windows Remote Desktop Protocol Core Security Feature Bypass Vulnerability
Executive Summary
None
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.7
EPSS Score
0.02967
probability of exploitation in the next 30 days
0.85804 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
26 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4598231 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 for x64-based Systems | 4598231 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4598243 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4598243 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4598245 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4598245 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4598245 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4598230 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4598230 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4598230 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4598229 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4598229 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4598229 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 20H2 for x64-based Systems | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4598279 (Monthly Rollup) 4598289 (Security Only) Important Security Feature Bypass 4592471 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598279 4598289 Windows 7 for x64-based Systems Service Pack 1 4598279 (Monthly Rollup) 4598289 (Security Only) Important Security Feature Bypass 4592471 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598279 4598289 Windows 8.1 for 32-bit systems 4598285 (Monthly Rollup) 4598275 (Security Only) 4598285 (Monthly Rollup) Important Security Feature Bypass 4592484 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598285 4598275 4598285 Windows 8.1 for x64-based systems 4598285 (Monthly Rollup) 4598275 (Security Only) 4598285 (Monthly Rollup) Important Security Feature Bypass 4592484 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598285 4598275 4598285 Windows RT 8.1 4598285 (Monthly Rollup) 4598285 (Monthly Rollup) Important Security Feature Bypass 4592484 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598285 4598285 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4598279 (Monthly Rollup) 4598289 (Security Only) Important Security Feature Bypass 4592471 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598279 4598289 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4598279 (Monthly Rollup) 4598289 (Security Only) Important Security Feature Bypass 4592471 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598279 4598289 Windows Server 2012 4598278 (Monthly Rollup) 4598297 (Security Only) Important Security Feature Bypass 4592468 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598278 4598297 Windows Server 2012 (Server Core installation) 4598278 (Monthly Rollup) 4598297 (Security Only) Important Security Feature Bypass 4592468 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598278 4598297 Windows Server 2012 R2 4598285 (Monthly Rollup) 4598275 (Security Only) 4598285 (Monthly Rollup) Important Security Feature Bypass 4592484 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598285 4598275 4598285 Windows Server 2012 R2 (Server Core installation) 4598285 (Monthly Rollup) 4598275 (Security Only) 4598285 (Monthly Rollup) Important Security Feature Bypass 4592484 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598285 4598275 4598285 Windows Server 2016 | 4598243 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4598243 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 | 4598230 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 (Server Core installation) | 4598230 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1909 (Server Core installation) | 4598229 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 2004 (Server Core installation) | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 4598242 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
6 patches
| Article | Type | Restart |
|---|---|---|
4598231 |
Security Update | Yes |
4598243 |
Security Update | Yes |
4598245 |
Security Update | Yes |
4598230 |
Security Update | Yes |
4598229 |
Security Update | Yes |
4598242 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Owen Rowe & Christopher Rowe Mycroft Solutions Ltd www.mycroftsolutions.com [email protected]
References
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