OnlyFm252
Internet Explorer

CVE-2020-1093 — VBScript Remote Code Execution Vulnerability

Moderate CVSS 7.5 EPSS 0.07175 2020-05 archive

Executive Summary

A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as 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 web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the IE rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

Overview

7.5
CVSS HIGH
Moderate
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released May 12 2020
Last Updated May 12 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.07175 — 0.93486 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS 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
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7

EPSS Score

0.07175
probability of exploitation in the next 30 days
0.93486 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

22 affected products
Product KB Article Severity Impact Restart Required
Internet Explorer 11 on Windows 10 for 32-bit Systems 4556826 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 for x64-based Systems 4556826 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems 4556813 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems 4556813 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems 4556812 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems 4556812 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems 4556812 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems 4556807 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems 4556807 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems 4556807 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems 4551853 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems 4551853 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems 4551853 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems 4556799 (Security Update) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4556798 (IE Cumulative) 4556836 (Monthly Rollup) Critical Remote Code Execution 4550905 4550964 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4556836 Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 4556798 (IE Cumulative) 4556836 (Monthly Rollup) Critical Remote Code Execution 4550905 4550964 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4556836 Internet Explorer 11 on Windows 8.1 for 32-bit systems 4556798 (IE Cumulative) 4556846 (Monthly Rollup) Critical Remote Code Execution 4550905 4550961 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 8.1 for x64-based systems 4556798 (IE Cumulative) 4556846 (Monthly Rollup) Critical Remote Code Execution 4550905 4550961 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows RT 8.1 4556846 (Monthly Rollup) Critical Remote Code Execution Yes
Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4556798 (IE Cumulative) 4556836 (Monthly Rollup) Moderate Remote Code Execution 4550905 4550964 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4556836 Internet Explorer 11 on Windows Server 2012 4556798 (IE Cumulative) 4556840 (Monthly Rollup) Moderate Remote Code Execution 4550905 4550917 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2012 R2 4556798 (IE Cumulative) 4556846 (Monthly Rollup) Moderate Remote Code Execution 4550905 4550961 Base: 6.4 Temporal: 5.8 Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2016 4556813 (Security Update) Moderate Remote Code Execution Yes
Internet Explorer 11 on Windows Server 2019 4551853 (Security Update) Moderate Remote Code Execution Yes

Patches

7 patches
Article Type Restart
4556826 Security Update Yes
4556813 Security Update Yes
4556812 Security Update Yes
4556807 Security Update Yes
4551853 Security Update Yes
4556799 Security Update Yes
4556846 Monthly Rollup Yes

Known Exploits

Acknowledgments

Qihoo 360 Vulcan Team

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