OnlyPatch
Microsoft Windows

CVE-2021-1657 — Windows Fax Compose Form Remote Code Execution Vulnerability

Important CVSS 7.8 EPSS 0.00939 2021-01 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Jan 12 2021
Last Updated Jan 12 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00939 — 0.57247 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
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: 6.8

EPSS Score

0.00939
probability of exploitation in the next 30 days
0.57247 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 Remote Code Execution Yes
Windows 10 for x64-based Systems 4598231 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 4598243 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 4598243 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1803 for 32-bit Systems 4598245 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1803 for ARM64-based Systems 4598245 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1803 for x64-based Systems 4598245 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 4598230 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 4598230 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 4598230 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for 32-bit Systems 4598229 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for ARM64-based Systems 4598229 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for x64-based Systems 4598229 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for 32-bit Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for ARM64-based Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for x64-based Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 20H2 for 32-bit Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 20H2 for ARM64-based Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 20H2 for x64-based Systems 4598242 (Security Update) Important Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 4598279 (Monthly Rollup) 4598289 (Security Only) Important Remote Code Execution 4592471 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592471 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592484 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592484 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592484 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 for 32-bit Systems Service Pack 2 4598288 (Monthly Rollup) 4598287 (Security Only) Important Remote Code Execution 4592498 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598288 4598287 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4598288 (Monthly Rollup) 4598287 (Security Only) Important Remote Code Execution 4592498 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598288 4598287 Windows Server 2008 for x64-based Systems Service Pack 2 4598288 (Monthly Rollup) 4598287 (Security Only) Important Remote Code Execution 4592498 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598288 4598287 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4598288 (Monthly Rollup) 4598287 (Security Only) Important Remote Code Execution 4592498 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4598288 4598287 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4598279 (Monthly Rollup) 4598289 (Security Only) Important Remote Code Execution 4592471 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592471 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592468 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592468 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592484 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution 4592484 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.0/AV:L/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 Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 4598243 (Security Update) Important Remote Code Execution Yes
Windows Server 2019 4598230 (Security Update) Important Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 4598230 (Security Update) Important Remote Code Execution Yes
Windows Server, version 1909 (Server Core installation) 4598229 (Security Update) Important Remote Code Execution Yes
Windows Server, version 2004 (Server Core installation) 4598242 (Security Update) Important Remote Code Execution Yes
Windows Server, version 20H2 (Server Core Installation) 4598242 (Security Update) Important Remote Code Execution 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

Acknowledgments

Tran Van Khang – khangkito (VinCSS)

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