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ExploitedIn CISA KEVFix available

CVE-2018-8373

Exploitation confirmed. First attested on 2022-03-25 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2018-08-15
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-08-1517:29CVE publishedNVD
  2. 2022-03-25Added to the CISA KEV catalogCISA KEV
  3. 2022-03-25Listed as exploited by GCVEGCVE
  4. 2022-03-25Exploitation first reportedCISA KEV
  5. 2025-02-0716:25SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-8373?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-8373?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Microsoft internet explorerversion to verify
BranchAffectedFixed in
11.x= 11no fix published
10.x= 10no fix published
9.x= 9no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Internet Explorer 9
    Affected
    • = Windows Server 2008 for 32-bit Systems Service Pack 2no fix stated
    • = Windows Server 2008 for x64-based Systems Service Pack 2no fix stated
  • Microsoft Internet Explorer 11
    Affected
    • = Windows 10 for 32-bit Systemsno fix stated
    • = Windows 10 for x64-based Systemsno fix stated
    • = Windows 10 Version 1607 for 32-bit Systemsno fix stated
    • = Windows 10 Version 1607 for x64-based Systemsno fix stated
    • = Windows 10 Version 1703 for 32-bit Systemsno fix stated
    • = Windows 10 Version 1703 for x64-based Systemsno fix stated
    • = Windows 10 Version 1709 for 32-bit Systemsno fix stated
    • = Windows 10 Version 1709 for x64-based Systemsno fix stated

    10 more version lines in the CVE record.

  • Microsoft Internet Explorer 10
    Affected
    • = Windows Server 2012no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2018-08-16

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-04-15

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-03-25
Patch Due Date
2022-04-15
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2018-08-15
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-9qm8-3m9q-ghgq

Frequently asked questions

What is CVE-2018-8373?

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.

Is CVE-2018-8373 actively exploited?

Yes. CVE-2018-8373 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-15.

What is the CVSS score for CVE-2018-8373?

CVE-2018-8373 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record