Microsoft SMBv3 Remote Code Execution Vulnerability

What it is

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.

Why we say that

• Linked by CISA to known ransomware campaigns
• EPSS puts exploitation in the next 30 days at 100%
• 3 public exploits published
• CISA's federal remediation deadline (2022-08-10) has passed
• CVSS 10 critical
• Listed in the CISA Known Exploited Vulnerabilities catalogue

Every line above comes from a named public source. Where the evidence is thin, we say so rather than inventing confidence — see methodology.

What to do

Apply updates per vendor instructions.

Public exploit code

Indexed from Exploit-DB. Presence of code raises urgency; absence does not mean safety.

• Microsoft Windows - 'SMBGhost' Remote Code Execution remote · windows · 2020-06-02
• Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Local Privilege Escalation local · windows · 2020-03-30
• Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Buffer Overflow (PoC) dos · windows · 2020-03-14