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CVE-2020-0796

Microsoft SMBv3 Remote Code Execution

10.0 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 99.8%
  1. Published12 Mar 2020
  2. Added to CISA KEV10 Feb 2022
  3. Remediation due10 Aug 2022
Actively exploited (CISA KEV)

A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server or client.

Added to KEV: 10 Feb 2022Federal remediation due: 10 Aug 2022Used in ransomware

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'.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

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

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2020-0796 being actively exploited?

Yes. CVE-2020-0796 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Feb 2022. It has been used in ransomware campaigns.

How severe is CVE-2020-0796?

CVE-2020-0796 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 99.8% probability of exploitation.

Which products are affected by CVE-2020-0796?

Affected products include Microsoft Windows 10 1903, Microsoft Windows 10 1909, Microsoft Windows Server 1903, Microsoft Windows Server 1909.

How do I fix CVE-2020-0796?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-0796 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.