Microsoft Scripting Engine
CVE-2020-1172 — Scripting Engine Memory Corruption Vulnerability
Executive Summary
A remote code execution vulnerability exists in the way that the ChakraCore scripting 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. The security update addresses the vulnerability by modifying how the ChakraCore scripting engine handles objects in memory.
Overview
4.2
CVSS MEDIUM
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
Low
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 3.8
EPSS Score
0.02125
probability of exploitation in the next 30 days
0.7951 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
25 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ChakraCore | Release Notes (Security Update) |
Critical | Remote Code Execution | Maybe |
| Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 4577049 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 4577049 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 4577015 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 4577015 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for 32-bit Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for ARM64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for x64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 2004 for 32-bit Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 2004 for ARM64-based Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 2004 for x64-based Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2016 | 4577015 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2019 | 4570333 (Security Update) |
Moderate | Remote Code Execution | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
4577049 |
Security Update | Yes |
4577015 |
Security Update | Yes |
4577041 |
Security Update | Yes |
4577032 |
Security Update | Yes |
4570333 |
Security Update | Yes |
4574727 |
Security Update | Yes |
4571756 |
Security Update | 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
None
References
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