Microsoft Browsers
CVE-2020-0878 — Microsoft Browser Memory Corruption Vulnerability
Executive Summary
A remote code execution vulnerability exists in the way that Microsoft browsers access objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to 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 that is designed to exploit the vulnerability through Microsoft browsers, 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. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically via an enticement in email or instant message, or by getting them to open an email attachment. The security update addresses the vulnerability by modifying how Microsoft browsers handle 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
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7
EPSS Score
0.02696
probability of exploitation in the next 30 days
0.83965 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
50 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ChakraCore | Release Notes (Security Update) |
Critical | Remote Code Execution | Maybe |
| Internet Explorer 11 on Windows 10 for 32-bit Systems | 4577049 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 for x64-based Systems | 4577049 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 4577015 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 4577015 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 4577041 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 4577032 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 4570333 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems | 4574727 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems | 4571756 (Security Update) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4577010 (IE Cumulative) 4577051 (Monthly Rollup) Critical Remote Code Execution 4571687 4571729 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 4577051 Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 4577010 (IE Cumulative) 4577051 (Monthly Rollup) Critical Remote Code Execution 4571687 4571729 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 4577051 Internet Explorer 11 on Windows 8.1 for 32-bit systems 4577010 (IE Cumulative) 4577066 (Monthly Rollup) Critical Remote Code Execution 4571687 4571703 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 4577066 4577066 Internet Explorer 11 on Windows 8.1 for x64-based systems 4577010 (IE Cumulative) 4577066 (Monthly Rollup) Critical Remote Code Execution 4571687 4571703 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 4577066 4577066 Internet Explorer 11 on Windows RT 8.1 | 4577066 (Monthly Rollup) |
Critical | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4577010 (IE Cumulative) 4577051 (Monthly Rollup) Moderate Remote Code Execution 4571687 4571729 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 4577051 Internet Explorer 11 on Windows Server 2012 4577010 (IE Cumulative) 4577038 (Monthly Rollup) Moderate Remote Code Execution 4571687 4571736 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 4577038 Internet Explorer 11 on Windows Server 2012 R2 4577010 (IE Cumulative) 4577066 (Monthly Rollup) Moderate Remote Code Execution 4571687 4571703 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 4577066 4577066 Internet Explorer 11 on Windows Server 2016 | 4577015 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 11 on Windows Server 2019 | 4570333 (Security Update) |
Moderate | Remote Code Execution | Yes |
| Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 4577064 (Monthly Rollup) 4577010 (IE Cumulative) Moderate Remote Code Execution 4571730 4571687 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 4577064 Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 4577064 (Monthly Rollup) 4577010 (IE Cumulative) Moderate Remote Code Execution 4571730 4571687 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 4577064 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
9 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 |
4577066 |
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
HAO LI of VenusTech ADLab
References
On This Page