CVE-2018-8174
High 7.5 Exploited in the wild (KEV) Used in ransomware campaigns
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
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.
Metrics
- CVSS 3.1
-
7.5 (HIGH)
Score source: NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 88% (percentile: 100) as of 1 November 2026
- CWE
- CWE-787
Affected products
microsoft: windows 10 1607; microsoft: windows 10 1703; microsoft: windows 10 1709; microsoft: windows 10 1803; microsoft: windows 7; microsoft: windows 8.1; microsoft: windows rt 8.1; microsoft: windows server 2008; microsoft: windows server 2012; microsoft: windows server 2016
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174 PatchVendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174 PatchVendor Advisory
- https://blog.0patch.com/2018/05/a-single-instruction-micropatch-for.html ExploitTechnical DescriptionThird Party Advisory
- https://www.exploit-db.com/exploits/44741/ ExploitThird Party AdvisoryVDB Entry
- https://blog.0patch.com/2018/05/a-single-instruction-micropatch-for.html ExploitTechnical DescriptionThird Party Advisory
- https://www.exploit-db.com/exploits/44741/ ExploitThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/103998 Third Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/103998 Third Party AdvisoryVDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018… US Government Resource