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Microsoft Windows

CVE-2020-0703 — Windows Backup Service Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.01 2020-02 archive

Executive Summary

An elevation of privilege vulnerability exists when the Windows Backup Service improperly handles file operations. To exploit this vulnerability, an attacker would first have to gain execution on the victim system. An attacker could then run a specially crafted application to elevate privileges. The security update addresses the vulnerability by correcting how the Windows Backup Service handles file operations.

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Feb 11 2020
Last Updated Feb 11 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01 — 0.58257 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:P/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
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0

EPSS Score

0.01
probability of exploitation in the next 30 days
0.58257 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 4537776 (Security Update) Important Elevation of Privilege Yes
Windows 10 for x64-based Systems 4537776 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1607 for 32-bit Systems 4537764 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1607 for x64-based Systems 4537764 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for 32-bit Systems 4537789 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for ARM64-based Systems 4537789 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for x64-based Systems 4537789 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for 32-bit Systems 4537762 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for ARM64-based Systems 4537762 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for x64-based Systems 4537762 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 4532691 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for ARM64-based Systems 4532691 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 4532691 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for 32-bit Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for ARM64-based Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for x64-based Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for 32-bit Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for ARM64-based Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for x64-based Systems 4532693 (Security Update) Important Elevation of Privilege Yes
Windows 7 for 32-bit Systems Service Pack 1 4537820 (Monthly Rollup) 4537813 (Security Only) Important Elevation of Privilege 4534310 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537813 Windows 7 for x64-based Systems Service Pack 1 4537820 (Monthly Rollup) 4537813 (Security Only) Important Elevation of Privilege 4534310 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537813 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4537820 (Monthly Rollup) 4537813 (Security Only) Important Elevation of Privilege 4534310 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537813 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4537820 (Monthly Rollup) 4537813 (Security Only) Important Elevation of Privilege 4534310 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537813 Windows Server 2012 4537814 (Monthly Rollup) 4537794 (Security Only) Important Elevation of Privilege 4534283 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537814 4537794 Windows Server 2012 (Server Core installation) 4537814 (Monthly Rollup) 4537794 (Security Only) Important Elevation of Privilege 4534283 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4537814 4537794 Windows Server 2016 4537764 (Security Update) Important Elevation of Privilege Yes
Windows Server 2016 (Server Core installation) 4537764 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 4532691 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 4532691 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1803 (Server Core Installation) 4537762 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1903 (Server Core installation) 4532693 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1909 (Server Core installation) 4532693 (Security Update) Important Elevation of Privilege Yes

Patches

6 patches
Article Type Restart
4537776 Security Update Yes
4537764 Security Update Yes
4537789 Security Update Yes
4537762 Security Update Yes
4532691 Security Update Yes
4532693 Security Update Yes

Known Exploits

Acknowledgments

Edward Torkington of NCC Group https://www.nccgroup.trust/, Yongil Lee of Diffense, Qihoo 360 Vulcan Team, Zak Rogness

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