CVE-2020-1064

MSHTML Engine Remote Code Execution Vulnerability

Published May 21, 2020 CVSS 3.1 · 7.5 High EPSS 3.2% KEV · Not listed

Description

A remote code execution vulnerability exists in the way that the MSHTML engine improperly validates input.
An attacker could execute arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
In a HTML editing attack scenario, an attacker could trick a user into editing a specially crafted file that is designed to exploit the vulnerability.
The security update addresses the vulnerability by modifying how MSHTML engine validates input.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Internet Explorer 11

affected

Version	Status	Constraints
`1.0.0`	affected	< publication

Microsoft

Internet Explorer 9

affected

Version	Status	Constraints
`1.0.0`	affected	< publication

Configuration 1 [-]

AND

cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*

Configuration 2 [-]

AND

cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_10:-:::::::*
	cpe:2.3:o:microsoft:windows_10:1607:::::::*
	cpe:2.3:o:microsoft:windows_10:1709:::::::*
	cpe:2.3:o:microsoft:windows_10:1803:::::::*
	cpe:2.3:o:microsoft:windows_10:1809:::::::*
	cpe:2.3:o:microsoft:windows_10:1903:::::::*
	cpe:2.3:o:microsoft:windows_10:1909:::::::*
	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2020-11956	A remote code execution vulnerability exists in the way that the MSHTML engine improperly validates input.An attacker could execute arbitrary code in the context of the current user, aka 'MSHTML Engine Remote Code Execution Vulnerability'.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

Access Vector Network

Access Complexity High

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is not in the KEV list.

Exploit prediction score: 3.2% (3.245% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1064
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1064

History

Aug 19, 2026 4:45 PM Description updated. Title updated. Affected versions updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description	A remote code execution vulnerability exists in the way that the MSHTML engine improperly validates input.An attacker could execute arbitrary code in the context of the current user, aka 'MSHTML Engine Remote Code Execution Vulnerability'.	A remote code execution vulnerability exists in the way that the MSHTML engine improperly validates input. An attacker could execute arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a HTML editing attack scenario, an attacker could trick a user into editing a specially crafted file that is designed to exploit the vulnerability. The security update addresses the vulnerability by modifying how MSHTML engine validates input.
Title		MSHTML Engine Remote Code Execution Vulnerability
CPEs		cpe:2.3:a:microsoft:internet_explorer:::::::: cpe:2.3:a:microsoft:internet_explorer::-::::::*
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1064
Metrics	cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C'}`

Subscriptions

Microsoft Internet Explorer Windows 10 Windows 7 Windows 8.1 Windows Rt 8.1 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019

Weaknesses