Exploited· due 2022-08-1010.0criticalCriticalused in ransomware

CVE-2020-0796

Microsoft Windows 10 1903

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'.

Exploitation status

CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
It is known to have been used in ransomware campaigns.
US federal civilian agencies are required to remediate it by 2022-08-10. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
A vendor advisory or patch reference has been published.

Required action

Apply updates per vendor instructions.

CISA’s wording, unedited.

What the metrics mean

It is reachable over a network, without needing local access.
For an attacker who can reach it, no special conditions are needed to exploit it.
To exploit it, no account is needed.
Beyond that, no action by a user is required.

Scoring

CVSS: 10.0 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-119
Assigned by: secure@microsoft.com

Dates

Published: 2020-03-12
Last modified: 2026-08-12
Added to KEV: 2022-02-10
Remediation due: 2022-08-10
Sources: CISA KEV, NVD

Affected products

Microsoft Windows 10 1903all versions
Microsoft Windows 10 1909all versions
Microsoft Windows Server 1903all versions
Microsoft Windows Server 1909all versions

As listed in the NVD configuration data. Not a statement about your estate.