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CVE-2017-0143

Microsoft Windows Server Message Block (SMBv1) Remote Code Execution Vulnerability

  • High 8.8
  • Exploited: added to CISA KEV 3 Nov 2021
  • Used in ransomware campaigns
  • A public exploit reference is listed

Description

The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to execute arbitrary code via crafted packets, aka "Windows SMB Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0144, CVE-2017-0145, CVE-2017-0146, and CVE-2017-0148.

Key facts

Published
17 Mar 2017
Last changed
21 Oct 2025
Assigned by
microsoft
KEV added
3 Nov 2021
KEV fix due
3 May 2022
Used in ransomware
Yes, according to CISA
EPSS
93.307% likely to be exploited in the next 30 days, higher than 99.84% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.8CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Microsoft CorporationWindows SMB
  • The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607 (affected)

Timeline

  1. 17 Mar 2017 Published
  2. 3 Nov 2021 CVE-2017-0143 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

References