CVE-2020-0796
CriticalExploitedPublic exploitA 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'.
Published Mar 12, 2020 · Updated Oct 1, 2026 · Also known as CoronaBlue, SMB Ghost, SMBGhost
Key Facts
Patch immediately- CVE-2020-0796 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting Windows 10 1903 (Microsoft), Windows 10 1909 (Microsoft), Windows Server 1903 (Microsoft) and 9 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 27, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2020-0796 brief as a PDF
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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'.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 10, 2022 | Aug 10, 2022 | Known |
| Industry KEV feed | May 27, 2020 | Aug 10, 2022 | Known |
| CIRCL KEV | Feb 10, 2022 | Aug 10, 2022 | Known |
| ENISA EUVD | Feb 10, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
16 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1903Microsoft | See advisory | n/a |
| Windows 10 1909Microsoft | See advisory | n/a |
| Windows Server 1903Microsoft | See advisory | n/a |
| Windows Server 1909Microsoft | See advisory | n/a |
| Windows 10 Version 1903 for 32-bit Systems | >= unspecified | n/a |
Timeline
Publicly disclosed
Mar 12, 2020
Added to Industry KEV feed
May 27, 2020
Added to CISA KEV
Feb 10, 2022
Added to CIRCL KEV
Feb 10, 2022
Added to ENISA EUVD
Feb 10, 2022
Last updated
Oct 1, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisoryhttp://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.html
- advisoryhttp://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.html
- advisoryhttp://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.html
- advisoryhttp://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.html
- patchhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796
FAQ
Common Questions.
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'.
Affected: Windows 10 1903 (Microsoft); Windows 10 1909 (Microsoft); Windows Server 1903 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 27, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Feb 10, 2022 with a federal remediation due date of Aug 10, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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