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CVE-2018-8373

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 scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

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.

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
0.61770 (61.8% probability)
Percentile
99.2%
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 Scripting Engine Memory Corruption Vulnerability
Added to the catalog
Mar 25, 2022
Federal due date
Apr 15, 2022

CISA assessment as of Feb 7, 2025

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 names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.

Affected products

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

  • Microsoft Internet Explorer 9

    • affected: Windows Server 2008 for 32-bit Systems Service Pack 2
    • affected: Windows Server 2008 for x64-based Systems Service Pack 2

  • Microsoft Internet Explorer 11

    • affected: Windows 10 for 32-bit Systems
    • affected: Windows 10 for x64-based Systems
    • affected: Windows 10 Version 1607 for 32-bit Systems
    • affected: Windows 10 Version 1607 for x64-based Systems
    • affected: Windows 10 Version 1703 for 32-bit Systems
    • affected: Windows 10 Version 1703 for x64-based Systems
    • affected: Windows 10 Version 1709 for 32-bit Systems
    • affected: Windows 10 Version 1709 for x64-based Systems
    • affected: Windows 10 Version 1803 for 32-bit Systems
    • affected: Windows 10 Version 1803 for x64-based Systems
    • affected: Windows 7 for 32-bit Systems Service Pack 1
    • affected: Windows 7 for x64-based Systems Service Pack 1
    • affected: Windows 8.1 for 32-bit systems
    • affected: Windows 8.1 for x64-based systems
    • affected: Windows RT 8.1
    • affected: Windows Server 2008 R2 for x64-based Systems Service Pack 1
    • affected: Windows Server 2012 R2
    • affected: Windows Server 2016

  • Microsoft Internet Explorer 10

    • affected: Windows Server 2012

References

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

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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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, 19:48 UTC. Sources and licenses