Microsoft Scripting Engine
CVE-2019-0920 — Scripting Engine Memory Corruption Vulnerability
Executive Summary
A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. 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 designed to exploit the vulnerability through a Microsoft browser 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 browser 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
4.3
CVSS MEDIUM
Critical
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
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
0.05524
probability of exploitation in the next 30 days
0.91978 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Internet Explorer 10 on Windows Server 2012 4503285 (Monthly Rollup) 4503259 (IE Cumulative) Moderate Remote Code Execution 4499171 4498206 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 10 for 32-bit Systems | 4503291 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 for x64-based Systems | 4503291 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 4503267 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 4503267 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems | 4503279 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems | 4503279 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 4503284 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 4503284 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 4503284 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 4503286 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 4503286 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 4503286 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 4503327 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 4503327 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 4503327 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | 4503293 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | 4503293 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | 4503293 (Security Update) |
Critical | Remote Code Execution | No |
| Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4503292 (Monthly Rollup) 4503259 (IE Cumulative) Critical Remote Code Execution 4499164 4498206 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 7 for x64-based Systems Service Pack 1 4503292 (Monthly Rollup) 4503259 (IE Cumulative) Critical Remote Code Execution 4499164 4498206 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 32-bit systems 4503276 (Monthly Rollup) 4503259 (IE Cumulative) Critical Remote Code Execution 4499151 4498206 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 4503276 (Monthly Rollup) 4503259 (IE Cumulative) Critical Remote Code Execution 4499151 4498206 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 | 4503276 (Monthly Rollup) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4503292 (Monthly Rollup) 4503259 (IE Cumulative) Moderate Remote Code Execution 4499164 4498206 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 | 4503259 (IE Cumulative) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2012 R2 4503276 (Monthly Rollup) 4503259 (IE Cumulative) Moderate Remote Code Execution 4499151 4498206 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 | 4503267 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2019 | 4503327 (Security Update) |
Moderate | Remote Code Execution | Yes |
Patches
9 patches
| Article | Type | Restart |
|---|---|---|
4503291 |
Security Update | Yes |
4503267 |
Security Update | Yes |
4503279 |
Security Update | Yes |
4503284 |
Security Update | Yes |
4503286 |
Security Update | Yes |
4503327 |
Security Update | Yes |
4503293 |
Security Update | Yes |
4503276 |
Monthly Rollup | Yes |
4503259 |
IE Cumulative | 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
Yuki Chen of Qihoo 360 Vulcan Team
Anonymous working with Trend Micro's Zero Day Initiative
References
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