VulnerabilityAnalyzed

CVE-2020-0796

Microsoft SMBv3 Remote Code Execution Vulnerability

KEVEXPLOIT ×3CRITICAL 10.0EPSS 99.8%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 10 August 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

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: 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS: 99.81% probability · 100th percentile
Public exploits: 3 in Exploit-DB · first 14 March 2020
CISA KEV: Listed 10 February 2022 · due 10 August 2022 · used in ransomware campaigns
Weakness: CWE-119
Affected: microsoft/windows 10 1903 · microsoft/windows 10 1909 · microsoft/windows server 1903 · microsoft/windows server 1909
Source: secure@microsoft.com

EPSS trend

EPSS 99.8% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

CISA notes

Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2020-0796

Public exploits (3)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-ID	Title	Type	Published	Verified
EDB-48537 source ↗	Microsoft Windows - 'SMBGhost' Remote Code Executionwindows · chompie1337	remote	2 June 2020	no
EDB-48267 source ↗	Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Local Privilege Escalationwindows · Daniel García Gutiérrez	local	30 March 2020	no
EDB-48216 source ↗	Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Buffer Overflow (PoC)windows · eerykitty	dos	14 March 2020	no

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.