Microsoft Scripting Engine
CVE-2020-0640 — Internet Explorer Memory Corruption Vulnerability
Executive Summary
A remote code execution vulnerability exists when Internet Explorer improperly accesses 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, the attacker 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. An attacker could host a specially crafted website designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action, typically by an enticement in an email or instant message, or by getting the user to open an attachment sent through email. The security update addresses the vulnerability by modifying how Internet Explorer handles objects in memory.
Overview
7.5
CVSS HIGH
Moderate
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
Temporal Score: 6.7
EPSS Score
0.08167
probability of exploitation in the next 30 days
0.94134 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
32 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Internet Explorer 10 on Windows Server 2012 | 4534283 (Monthly Rollup) 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 for 32-bit Systems | 4534306 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 for x64-based Systems | 4534306 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 4534271 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 4534271 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 4534276 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 4534276 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 4534276 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 4534293 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 4534293 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 4534293 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 4534273 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 4534273 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 4534273 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems | 4528760 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | 4534310 (Monthly Rollup) 4534251 (IE Cumulative) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | 4534310 (Monthly Rollup) 4534251 (IE Cumulative) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 8.1 for 32-bit systems | 4534297 (Monthly Rollup) 4534251 (IE Cumulative) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 8.1 for x64-based systems | 4534297 (Monthly Rollup) 4534251 (IE Cumulative) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows RT 8.1 | 4534297 (Monthly Rollup) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4534310 (Monthly Rollup) 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2012 | 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2012 R2 | 4534297 (Monthly Rollup) 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2016 | 4534271 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2019 | 4534273 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | 4534303 (Monthly Rollup) 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | 4534303 (Monthly Rollup) 4534251 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
Patches
12 patches
| Article | Type | Restart |
|---|---|---|
4534283 (Monthly Rollup) 4534251 |
Monthly Rollup | Yes |
4534306 |
Security Update | Yes |
4534271 |
Security Update | Yes |
4534276 |
Security Update | Yes |
4534293 |
Security Update | Yes |
4534273 |
Security Update | Yes |
4528760 |
Security Update | Yes |
4534310 (Monthly Rollup) 4534251 |
Monthly Rollup | Yes |
4534297 (Monthly Rollup) 4534251 |
Monthly Rollup | Yes |
4534297 |
Monthly Rollup | Yes |
4534251 |
IE Cumulative | Yes |
4534303 (Monthly Rollup) 4534251 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
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