7.6

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

CVSS: 7.6v2.0HighKEVAnalyzed
Published 15-08-2018Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2018-8373 is a high (CVSS 7.6) Out-of-bounds Write vulnerability in Microsoft Internet Explorer Scripting Engine. It is known to be exploited: CISA lists it, first on 25-03-2022. EPSS estimates a 61.51% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.6/10
010
High · v2.0 (NVD)
EPSS score
61.51%
0%100%
Critical · -0.40 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-08-2018
    PublishedVulnerability first disclosed.
  2. 25-03-2022
    Added to CISA KEVMicrosoft Scripting Engine Memory Corruption Vulnerability
  3. 15-04-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

61.51%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

-0.40 pp

From 61.91% on 20-09-2026

20-09-202620-10-2026
EPSS score
61.51%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
25-03-2022
Federal due date
15-04-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2018-8373

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft4 products
  • internet_explorerEOL11 | 10 | 9
  • internet explorer 10Windows Server 2012
  • internet explorer 11Windows 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 | Windows 10 Version 1703 for 32-bit Systems | Windows 10 Version 1703 for x64-based Systems | Windows 10 Version 1709 for 32-bit Systems | Windows 10 Version 1709 for x64-based Systems | Windows 10 Version 1803 for 32-bit Systems | Windows 10 Version 1803 for x64-based Systems | Windows 7 for 32-bit Systems Service Pack 1 | Windows 7 for x64-based Systems Service Pack 1 | Windows 8.1 for 32-bit systems | Windows 8.1 for x64-based systems | Windows RT 8.1 | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | Windows Server 2012 R2 | Windows Server 2016
  • internet explorer 9Windows Server 2008 for 32-bit Systems Service Pack 2 | Windows Server 2008 for x64-based Systems Service Pack 2

1 vendor · 4 products

References

4 links