# CVE-2018-8174: Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability

> CVE-2018-8174: Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2018-8174
Last updated: 2026-08-13T03:55:29Z

- Published: 2018-05-09 19:00 UTC · Updated: 2026-08-13 03:55 UTC · Assigner: microsoft
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 88.2%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-02-15, federal due date 2022-08-15, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows 10
- Microsoft: Windows 10 Servers
- Microsoft: Windows 7
- Microsoft: Windows 8.1
- Microsoft: Windows RT 8.1
- Microsoft: Windows Server 2008
- Microsoft: Windows Server 2008 R2
- Microsoft: Windows Server 2012
- Microsoft: Windows Server 2012 R2
- Microsoft: Windows Server 2016

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-8174)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2018-8174)
- [https://blog.0patch.com/2018/05/a-single-instruction-micropatch-for.html](https://blog.0patch.com/2018/05/a-single-instruction-micropatch-for.html)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174)
- [https://www.exploit-db.com/exploits/44741/](https://www.exploit-db.com/exploits/44741/)
- [http://www.securityfocus.com/bid/103998](http://www.securityfocus.com/bid/103998)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2018-8174 · Markdown: https://rewindex.com/cve/CVE-2018-8174.md · JSON: https://rewindex.com/api/v1/cves/CVE-2018-8174 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:45:10.969Z