# CVE-2018-8174: Windows VBScript Engine Remote Code Execution Vulnerability CVE-2018-8174 is fixed in 31 products on 1 platform, first by KB4103723, released May 8, 2018. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on February 15, 2022, with known ransomware use. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/cve/CVE-2018-8174 - Priority: Patch now - CVSS: 7.5 (Critical) - EPSS: 0.8824 - CISA KEV: listed Feb 15, 2022, federal due date Aug 15, 2022, known ransomware use - Exploited (vendor report): yes - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Detected - Published: May 8, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8174 ## Description

A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the IE rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability.

The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.1088 | [KB4103731](https://patchblox.com/security/data/fix/microsoft/kb4103731.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1088 | [KB4103731](https://patchblox.com/security/data/fix/microsoft/kb4103731.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.431 | [KB4103727](https://patchblox.com/security/data/fix/microsoft/kb4103727.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.431 | [KB4103727](https://patchblox.com/security/data/fix/microsoft/kb4103727.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.48 | [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.48 | [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 | | Microsoft | Windows 10 for 32-bit Systems | 10240.17861 | [KB4103716](https://patchblox.com/security/data/fix/microsoft/kb4103716.md) | May 8, 2018 | | Microsoft | Windows 10 for x64-based Systems | 10240.17861 | [KB4103716](https://patchblox.com/security/data/fix/microsoft/kb4103716.md) | May 8, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4103718](https://patchblox.com/security/data/fix/microsoft/kb4103718.md) | May 8, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4103712](https://patchblox.com/security/data/fix/microsoft/kb4103712.md) | May 8, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4103718](https://patchblox.com/security/data/fix/microsoft/kb4103718.md) | May 8, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4103712](https://patchblox.com/security/data/fix/microsoft/kb4103712.md) | May 8, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4103725](https://patchblox.com/security/data/fix/microsoft/kb4103725.md) | May 8, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4103715](https://patchblox.com/security/data/fix/microsoft/kb4103715.md) | May 8, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4103725](https://patchblox.com/security/data/fix/microsoft/kb4103725.md) | May 8, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4103715](https://patchblox.com/security/data/fix/microsoft/kb4103715.md) | May 8, 2018 | | Microsoft | Windows RT 8.1 | | [KB4103725](https://patchblox.com/security/data/fix/microsoft/kb4103725.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4103718](https://patchblox.com/security/data/fix/microsoft/kb4103718.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4103712](https://patchblox.com/security/data/fix/microsoft/kb4103712.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4103718](https://patchblox.com/security/data/fix/microsoft/kb4103718.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4103712](https://patchblox.com/security/data/fix/microsoft/kb4103712.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4103718](https://patchblox.com/security/data/fix/microsoft/kb4103718.md) | May 8, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4103712](https://patchblox.com/security/data/fix/microsoft/kb4103712.md) | May 8, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4134651](https://patchblox.com/security/data/fix/microsoft/kb4134651.md) | May 8, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4134651](https://patchblox.com/security/data/fix/microsoft/kb4134651.md) | May 8, 2018 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4134651](https://patchblox.com/security/data/fix/microsoft/kb4134651.md) | May 8, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4134651](https://patchblox.com/security/data/fix/microsoft/kb4134651.md) | May 8, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4134651](https://patchblox.com/security/data/fix/microsoft/kb4134651.md) | May 8, 2018 | | Microsoft | Windows Server 2012 | | [KB4103730](https://patchblox.com/security/data/fix/microsoft/kb4103730.md) | May 8, 2018 | | Microsoft | Windows Server 2012 | | [KB4103726](https://patchblox.com/security/data/fix/microsoft/kb4103726.md) | May 8, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4103730](https://patchblox.com/security/data/fix/microsoft/kb4103730.md) | May 8, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4103726](https://patchblox.com/security/data/fix/microsoft/kb4103726.md) | May 8, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4103725](https://patchblox.com/security/data/fix/microsoft/kb4103725.md) | May 8, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4103715](https://patchblox.com/security/data/fix/microsoft/kb4103715.md) | May 8, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4103725](https://patchblox.com/security/data/fix/microsoft/kb4103725.md) | May 8, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4103715](https://patchblox.com/security/data/fix/microsoft/kb4103715.md) | May 8, 2018 | | Microsoft | Windows Server 2016 | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.2248 | [KB4103723](https://patchblox.com/security/data/fix/microsoft/kb4103723.md) | May 8, 2018 | | Microsoft | Windows Server, version 1709 (Server Core Installation) | 16299.431 | [KB4103727](https://patchblox.com/security/data/fix/microsoft/kb4103727.md) | May 8, 2018 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.48 | [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo