Windows Task Scheduler
CVE-2020-1113 — Windows Task Scheduler Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass vulnerability exists in Microsoft Windows when the Task Scheduler service fails to properly verify client connections over RPC. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, a man-in-the-middle attacker would need to send a specially crafted request to a vulnerable system. The security update addresses the vulnerability by correcting how the Task Scheduler service validates connections.
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8
EPSS Score
0.07277
probability of exploitation in the next 30 days
0.93564 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
27 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4556826 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 for x64-based Systems | 4556826 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4556813 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4556813 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4556812 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4556812 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4556812 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4556807 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4556807 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4556807 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4551853 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4551853 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4551853 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4556836 (Monthly Rollup) 4556843 (Security Only) Important Security Feature Bypass 4550964 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556836 4556843 Windows 7 for x64-based Systems Service Pack 1 4556836 (Monthly Rollup) 4556843 (Security Only) Important Security Feature Bypass 4550964 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556836 4556843 Windows 8.1 for 32-bit systems 4556846 (Monthly Rollup) 4556853 (Security Only) Important Security Feature Bypass 4550961 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4556846 (Monthly Rollup) 4556853 (Security Only) Important Security Feature Bypass 4550961 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows RT 8.1 | 4556846 (Monthly Rollup) |
Important | Security Feature Bypass | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4556860 (Monthly Rollup) 4556854 (Security Only) Important Security Feature Bypass 4550951 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4556860 (Monthly Rollup) 4556854 (Security Only) Important Security Feature Bypass 4550951 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 for x64-based Systems Service Pack 2 4556860 (Monthly Rollup) 4556854 (Security Only) Important Security Feature Bypass 4550951 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4556860 (Monthly Rollup) 4556854 (Security Only) Important Security Feature Bypass 4550951 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4556836 (Monthly Rollup) 4556843 (Security Only) Important Security Feature Bypass 4550964 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556836 4556843 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4556836 (Monthly Rollup) 4556843 (Security Only) Important Security Feature Bypass 4550964 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes 4556836 4556843 Windows Server 2012 4556840 (Monthly Rollup) 4556852 (Security Only) Important Security Feature Bypass 4550917 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4556840 (Monthly Rollup) 4556852 (Security Only) Important Security Feature Bypass 4550917 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4556846 (Monthly Rollup) 4556853 (Security Only) Important Security Feature Bypass 4550961 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4556846 (Monthly Rollup) 4556853 (Security Only) Important Security Feature Bypass 4550961 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4556813 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4556813 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 | 4551853 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 (Server Core installation) | 4551853 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4556807 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1903 (Server Core installation) | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1909 (Server Core installation) | 4556799 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4556826 |
Security Update | Yes |
4556813 |
Security Update | Yes |
4556812 |
Security Update | Yes |
4556807 |
Security Update | Yes |
4551853 |
Security Update | Yes |
4556799 |
Security Update | Yes |
4556846 |
Monthly Rollup | 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
References
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