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Windows Update Stack

CVE-2020-17070 — Windows Update Medic Service Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.00886 2020-11 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Nov 10 2020
Last Updated Nov 10 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00886 — 0.5451 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

0.00886
probability of exploitation in the next 30 days
0.5451 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

23 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1803 for 32-bit Systems 4586785 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for ARM64-based Systems 4586785 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for x64-based Systems 4586785 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 4586793 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for ARM64-based Systems 4586793 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 4586793 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for 32-bit Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for ARM64-based Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for x64-based Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for 32-bit Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for ARM64-based Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for x64-based Systems 4586786 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for 32-bit Systems 4586781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for ARM64-based Systems 4586781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for x64-based Systems 4586781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 20H2 for 32-bit Systems 4586781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 20H2 for ARM64-based Systems 4586781 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 4586793 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 4586793 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1903 (Server Core installation) 4586786 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1909 (Server Core installation) 4586786 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 2004 (Server Core installation) 4586781 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 20H2 (Server Core Installation) 4586781 (Security Update) Important Elevation of Privilege Yes

Patches

4 patches
Article Type Restart
4586785 Security Update Yes
4586793 Security Update Yes
4586786 Security Update Yes
4586781 Security Update Yes

Known Exploits

Acknowledgments

Zhiniang Peng (@edwardzpeng) and Fangming Gu (@afang5472)

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