Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability

HIGH 7.5EXPLOITED (CISA KEV)CVE-2018-8174 · Published 09/05/2018 · updated 13/08/2026

Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 15/02/2022. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

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.

References

securityfocus.com/bid/103998 · Third Party Advisory
blog.0patch.com/2018/05/a-single-instruction-micropatch-for.html · Exploit
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174 · Patch
exploit-db.com/exploits/44741 · Exploit
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2018-8174

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