Windows SMB
CVE-2020-1301 — Windows SMB Authenticated Remote Code Execution Vulnerability
Executive Summary
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server. To exploit the vulnerability an authenticated attacker could send a specially crafted packet to a targeted SMBv1 server. The security update addresses the vulnerability by correcting how SMBv1 handles these specially crafted requests.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More 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:P/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
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7
EPSS Score
0.36708
probability of exploitation in the next 30 days
0.98299 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
30 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4561649 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 for x64-based Systems | 4561649 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4561616 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4561616 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4561602 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4561602 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4561602 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4561621 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4561621 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4561621 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4561608 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4561608 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4561608 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4557957 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4557957 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4557957 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4561643 (Monthly Rollup) 4561669 (Security Only) Important Remote Code Execution 4556836 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561643 4561669 Windows 7 for x64-based Systems Service Pack 1 4561643 (Monthly Rollup) 4561669 (Security Only) Important Remote Code Execution 4556836 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561643 4561669 Windows 8.1 for 32-bit systems 4561666 (Monthly Rollup) 4561673 (Security Only) 4561666 (Monthly Rollup) Important Remote Code Execution 4556846 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4561666 (Monthly Rollup) 4561673 (Security Only) 4561666 (Monthly Rollup) Important Remote Code Execution 4556846 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1 4561666 (Monthly Rollup) 4561666 (Monthly Rollup) Important Remote Code Execution 4556846 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 4561670 (Monthly Rollup) 4561645 (Security Only) Important Remote Code Execution 4556860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561670 4561645 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4561670 (Monthly Rollup) 4561645 (Security Only) Important Remote Code Execution 4556860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561670 4561645 Windows Server 2008 for x64-based Systems Service Pack 2 4561670 (Monthly Rollup) 4561645 (Security Only) Important Remote Code Execution 4556860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561670 4561645 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4561670 (Monthly Rollup) 4561645 (Security Only) Important Remote Code Execution 4556860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561670 4561645 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4561643 (Monthly Rollup) 4561669 (Security Only) Important Remote Code Execution 4556836 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561643 4561669 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4561643 (Monthly Rollup) 4561669 (Security Only) Important Remote Code Execution 4556836 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4561643 4561669 Windows Server 2012 4561612 (Monthly Rollup) 4561674 (Security Only) Important Remote Code Execution 4556840 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4561612 (Monthly Rollup) 4561674 (Security Only) Important Remote Code Execution 4556840 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4561666 (Monthly Rollup) 4561673 (Security Only) 4561666 (Monthly Rollup) Important Remote Code Execution 4556846 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4561666 (Monthly Rollup) 4561673 (Security Only) 4561666 (Monthly Rollup) Important Remote Code Execution 4556846 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4561616 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 4561616 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 4561608 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 4561608 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4561621 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1903 (Server Core installation) | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1909 (Server Core installation) | 4560960 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 2004 (Server Core installation) | 4557957 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4561649 |
Security Update | Yes |
4561616 |
Security Update | Yes |
4561602 |
Security Update | Yes |
4561621 |
Security Update | Yes |
4561608 |
Security Update | Yes |
4560960 |
Security Update | Yes |
4557957 |
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
Nicolas Delhaye of AIRBUS
References
On This Page