VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 25 March 2022Ransomware use: unknown
Microsoft Internet Explorer Scripting Engine

CVE-2018-8373: Microsoft Scripting Engine Memory Corruption Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, 1,318 days after the CVE record was published.

How likely is exploitation in the next 30 days?
61.5%

EPSS score, percentile 99.2 of all scored records

How severe?
7.5 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 15 Apr 2022. Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows 10 for 32-bit Systems
  • Windows 10 for x64-based Systems
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems

and 9 more in the table below

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 15 April 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Microsoft Internet Explorer 9
StatusVersions
AffectedWindows Server 2008 for 32-bit Systems Service Pack 2
AffectedWindows Server 2008 for x64-based Systems Service Pack 2
Microsoft Internet Explorer 11
StatusVersions
AffectedWindows 10 for 32-bit Systems
AffectedWindows 10 for x64-based Systems
AffectedWindows 10 Version 1607 for 32-bit Systems
AffectedWindows 10 Version 1607 for x64-based Systems
AffectedWindows 10 Version 1703 for 32-bit Systems
AffectedWindows 10 Version 1703 for x64-based Systems
AffectedWindows 10 Version 1709 for 32-bit Systems
AffectedWindows 10 Version 1709 for x64-based Systems
AffectedWindows 10 Version 1803 for 32-bit Systems
AffectedWindows 10 Version 1803 for x64-based Systems
AffectedWindows 7 for 32-bit Systems Service Pack 1
AffectedWindows 7 for x64-based Systems Service Pack 1

And 6 more version entries in the CVE record.

Microsoft Internet Explorer 10
StatusVersions
AffectedWindows Server 2012

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2018-8373 to its Known Exploited Vulnerabilities (KEV) catalog on 25 Mar 2022.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 15 Apr 2022.
  • The CVE record was published on 15 Aug 2018, 1,318 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 7.5 (High), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 61.5% (percentile 99.2), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
15 Aug 2018CVE record published
25 Mar 2022Added to CISA KEV
15 Apr 2022CISA due date for the required action
21 Oct 2025CVE record last updated

References

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