CVE-2020-0796

Name: CVE-2020-0796
Creator: NVD / NIST
Published: 2020-03-12T16:15:15.627+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10Actively ExploitedEPSS 99.81%

Last modified Jun 17, 2026

CVE-2020-0796 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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'.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.81% chance of exploitation in the next 30 days.

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'.

Metrics

CVSS 3.1

10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

99.81%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Aug 10, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10 1903	All versions
Microsoft	Windows 10 1909	All versions
Microsoft	Windows Server 1903	All versions
Microsoft	Windows Server 1909	All versions

References

http://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/156732/Microsoft-Windows-SMB-3.1.1-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157110/SMBv3-Compression-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796Patch, Vendor Advisory
http://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/156732/Microsoft-Windows-SMB-3.1.1-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157110/SMBv3-Compression-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0796US Government Resource

Timeline

Published: Mar 12, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-0796?

How severe is CVE-2020-0796?

CVE-2020-0796 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 99.81% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-0796?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-0796?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST