CVE-2018-8174

Out-of-bounds Write

CVSS 3.1 High 7.5Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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 data

CVSS 3.1 High 7.5

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: Required
A user has to do something first, such as opening a file or following a link.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	High	The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required	None	No account or privileges are needed.
User interaction	Required	A user has to do something first, such as opening a file or following a link.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.88243 (88.2% probability)
Percentile: 99.8%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: Microsoft Windows VBScript Engine Out-of-Bounds Write Vulnerability
Added to the catalog: Feb 15, 2022
Federal due date: Aug 15, 2022
Ransomware campaigns: Known use

CISA assessment as of Feb 14, 2022

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Weakness (CWE)

CWE catalog version 5.0.

CWE-787Out-of-bounds Write

Affected products

Products listed in the CVE record, as the CNA published them.

Microsoft Windows 7
- affected: 32-bit Systems Service Pack 1
- affected: x64-based Systems Service Pack 1
Microsoft Windows Server 2012 R2
- affected: (Server Core installation)
Microsoft Windows RT 8.1
- affected: Windows RT 8.1
Microsoft Windows Server 2008
- affected: 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)
Microsoft Windows Server 2012
- affected: (Server Core installation)
Microsoft Windows 8.1
- affected: 32-bit systems
- affected: x64-based systems
Microsoft Windows Server 2016
- affected: (Server Core installation)
Microsoft Windows Server 2008 R2
- affected: Itanium-Based Systems Service Pack 1
- affected: x64-based Systems Service Pack 1
- affected: x64-based Systems Service Pack 1 (Server Core installation)
Microsoft Windows 10
- affected: 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
Microsoft Windows 10 Servers
- affected: version 1709 (Server Core Installation)
- affected: version 1803 (Server Core Installation)

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

44741 (exploit-db.com)exploit
blog.0patch.com/2018/05/a-single-instruction-micropatch-for…
portal.msrc.microsoft.com/en-US/security-guidance/advisory/…
103998 (securityfocus.com)vdb-entry

Timeline

ID reservedMar 14, 2018
Record publishedMay 9, 2018
Added to CISA KEVFeb 15, 2022
Record last updatedAug 13, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:34 UTC. Sources and licenses