Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.8%; technical severity is CVSS 10.0.
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'.
Who should care
- Teams operating SMBv3, Windows 10 1903, Windows 10 1909 +2 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether SMBv3, Windows 10 1903, Windows 10 1909 +2 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CWE
- CWE-119
- Affected versions
- Microsoft SMBv3; Microsoft Windows 10 1903 (Version: -); Microsoft Windows 10 1909 (Version: -); Microsoft Windows Server 1903 (Version: -); Microsoft Windows Server 1909 (Version: -)
- Published
- 12 March 2020
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 99.8%
- Signal calculated at 88
External references
- Government advisory from www.cisa.gov
- Third-party advisory from packetstormsecurity.com
- Exploit information from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Exploit information from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com