Microsoft Scripting Engine
CVE-2019-0649 — Scripting Engine Elevation of Privileged Vulnerability
Executive Summary
A vulnerability exists in Microsoft Chakra JIT server. An attacker who successfully exploited this vulnerability could gain elevated privileges. The vulnerability by itself does not allow arbitrary code to run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (for example a remote code execution vulnerability and another elevation of privilege vulnerability) to take advantage of the elevated privileges when running. The security update addresses the vulnerability by modifying how Microsoft Chakra handles constructorCaches.
Overview
4.2
CVSS MEDIUM
Important
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: 3.8
EPSS Score
0.04326
probability of exploitation in the next 30 days
0.89917 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
13 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ChakraCore | Release Notes (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 4487020 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 4487020 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2019 | 4487044 (Security Update) |
Low | Elevation of Privilege | Yes |
Patches
5 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
4487020 |
Security Update | Yes |
4486996 |
Security Update | Yes |
4487017 |
Security Update | Yes |
4487044 |
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
References
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