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CVE-2018-8174

Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability

  • High 7.5
  • Exploited: added to CISA KEV 15 Feb 2022
  • Used in ransomware campaigns
  • A public exploit reference is listed

Description

A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka "Windows VBScript Engine Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Key facts

Published
9 May 2018
Last changed
13 Aug 2026
Assigned by
microsoft
KEV added
15 Feb 2022
KEV fix due
15 Aug 2022
Used in ransomware
Yes, according to CISA
EPSS
88.243% likely to be exploited in the next 30 days, higher than 99.773% 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.

  • 7.5CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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
MicrosoftWindows 7
  • 32-bit Systems Service Pack 1 (affected)
  • x64-based Systems Service Pack 1 (affected)
MicrosoftWindows Server 2012 R2
  • (Server Core installation) (affected)
MicrosoftWindows RT 8.1
  • Windows RT 8.1 (affected)
MicrosoftWindows Server 2008
  • 32-bit Systems Service Pack 2 (affected)
  • 32-bit Systems Service Pack 2 (Server Core installation) (affected)
  • Itanium-Based Systems Service Pack 2 (affected)
  • x64-based Systems Service Pack 2 (affected)
  • x64-based Systems Service Pack 2 (Server Core installation) (affected)
MicrosoftWindows Server 2012
  • (Server Core installation) (affected)
MicrosoftWindows 8.1
  • 32-bit systems (affected)
  • x64-based systems (affected)
MicrosoftWindows Server 2016
  • (Server Core installation) (affected)
MicrosoftWindows Server 2008 R2
  • Itanium-Based Systems Service Pack 1 (affected)
  • x64-based Systems Service Pack 1 (affected)
  • x64-based Systems Service Pack 1 (Server Core installation) (affected)
MicrosoftWindows 10
  • 32-bit Systems (affected)
  • Version 1607 for 32-bit Systems (affected)
  • Version 1607 for x64-based Systems (affected)
  • Version 1703 for 32-bit Systems (affected)
  • Version 1703 for x64-based Systems (affected)
  • Version 1709 for 32-bit Systems (affected)
  • Version 1709 for x64-based Systems (affected)
  • Version 1803 for 32-bit Systems (affected)
  • Version 1803 for x64-based Systems (affected)
  • x64-based Systems (affected)
MicrosoftWindows 10 Servers
  • version 1709 (Server Core Installation) (affected)
  • version 1803 (Server Core Installation) (affected)

Timeline

  1. 9 May 2018 Published
  2. 15 Feb 2022 CVE-2018-8174 added to CISA KEV
  3. 15 Feb 2022 Added to the CISA KEV catalogue

Weakness

References