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'.
An official patch is available. Apply the patch as soon as possible.
Consider disconnecting the vulnerable system from the internet until a fix is applied.
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityAttacked
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | cisa | E: U→A | 7.2 → 9.2 |
| 2026-07-21 | nvd | patch: Unavailable→Official Patch | 7.2 → 7.2 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 7.2 |
Affected Software
| Vendor | Product | Version |
|---|
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | unspecified |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | unspecified |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | unspecified |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems | unspecified |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems | unspecified |
| Microsoft | Windows 10 Version 1909 for x64-based Systems | unspecified |
| Microsoft | Windows Server, version 1903 (Server Core installation) | unspecified |
| Microsoft | Windows Server, version 1909 (Server Core installation) | unspecified |
| microsoft | windows_10_1903 | All versions |
| microsoft | windows_10_1909 | All versions |
| microsoft | windows_server_1903 | All versions |
| microsoft | windows_server_1909 | All versions |
Published: 2020-03-12
