Home/CVE/Microsoft SMBv3 Remote Code Execution Vulnerability
CVE

CVE-2020-0796

Microsoft SMBv3 Remote Code Execution Vulnerability

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'.

CRITICAL · CVSS 10 ⚠ CISA KEV EPSS 0.94424 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

2
actorMaze
actorREvil
⬡

Weakness Classification

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
▤

Affected Products & Versions

4
microsoft windows 10 1903all versions
microsoft windows 10 1909all versions
microsoft windows server 1903all versions
microsoft windows server 1909all versions
⚠

Public Exploits & PoCs

10
remoteMicrosoft Windows - 'SMBGhost' Remote Code Execution2020-06-02
localMicrosoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Local Privilege Escalation2020-03-30
dosMicrosoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Buffer Overflow (PoC)2020-03-14
nucleiMicrosoft SMBv3 - Remote Code Executioncritical
pocpacketstormsecurity.com · CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-...packetstormsecurity.com
pocpacketstormsecurity.com · Microsoft-Windows-SMB-3.1.1-Remote-Code-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation...packetstormsecurity.com
pocpacketstormsecurity.com · SMBv3-Compression-Buffer-Overflow.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Microsoft-Windows-SMBGhost-Remote-Code-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution...packetstormsecurity.com
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - Dumpert Process Dumper Default File
▣

Scoring & Timeline

10
CRITICAL · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Mar 2020 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2020-0796
msrcCVE-2020-0796Remote Code Execution
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0796US Government Resource
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