CVE-2020-0796
Microsoft SMBv3 Remote Code Execution Vulnerability
- Critical 10.0
- Exploited: added to CISA KEV 10 Feb 2022
- Used in ransomware campaigns
Description
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.
Key facts
- Published
- 12 Mar 2020
- Last changed
- 1 Oct 2026
- Assigned by
- microsoft
- KEV added
- 10 Feb 2022
- KEV fix due
- 10 Aug 2022
- Used in ransomware
- Yes, according to CISA
- EPSS
- 99.81% likely to be exploited in the next 30 days, higher than 99.959% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 10.0CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1903 for 32-bit Systems |
|
| Microsoft | Windows 10 Version 1903 for x64-based Systems |
|
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems |
|
| Microsoft | Windows Server, version 1903 (Server Core installation) |
|
| Microsoft | Windows 10 Version 1909 for 32-bit Systems |
|
| Microsoft | Windows 10 Version 1909 for x64-based Systems |
|
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems |
|
| Microsoft | Windows Server, version 1909 (Server Core installation) |
|
Timeline
- 12 Mar 2020 Published
- 10 Feb 2022 Added to the CISA KEV catalogue