A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer Memory Co…

published 2018-04-12 8y ago modified 2026-06-17 4mo ago also EUVD-2018-1767

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 15.4%; EPSS 15.4% chance of exploitation in 30 days, percentile 96%
public exploits: 0; none known

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer Memory Corruption Vulnerability." This affects Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-0870, CVE-2018-0997, CVE-2018-1018, CVE-2018-1020.

Patch / fix

links 1

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0991 advisory

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Exploit prediction

15.43% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	7.6	AV:N/AC:H/Au:N/C:C/I:C/A:C

Affected products

Microsoft Internet Explorer 11
Microsoft Internet Explorer 10

Classification

Weakness

CWE-787 Out-of-bounds Write

References

portal.msrc.microsoft.com /en-US/security-guidance/advisory/CVE-2018-0991
patch, vendor-advisory
securityfocus.com /bid/103614
vdb-entry, third-party-advisory
securitytracker.com /id/1040653
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-0991
NVD CVE-2018-0991

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