Microsoft Browsers
CVE-2019-1220 — Microsoft Browser Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass vulnerability exists when Microsoft Browsers fail to validate the correct Security Zone of requests for specific URLs. This could allow an attacker to cause a user to access a URL in a less restricted Internet Security Zone than intended. To exploit this vulnerability, an attacker could email or otherwise provide a specially crafted URL to a victim and convince them to click on it. The security update addresses the vulnerability by correcting security feature behavior to properly map affected URLs to the correct Security Zone.
Overview
4.3
CVSS MEDIUM
Low
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 3.9
EPSS Score
0.03812
probability of exploitation in the next 30 days
0.88937 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
42 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Internet Explorer 10 on Windows Server 2012 4516055 (Monthly Rollup) 4516046 (IE Cumulative) Low Security Feature Bypass 4512518 4511872 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 for 32-bit Systems | 4516070 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 for x64-based Systems | 4516070 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 4516044 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 4516044 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems | 4516068 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems | 4516068 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4516046 (IE Cumulative) 4516065 (Monthly Rollup) Important Security Feature Bypass 4511872 4512506 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 4516046 (IE Cumulative) 4516065 (Monthly Rollup) Important Security Feature Bypass 4511872 4512506 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 8.1 for 32-bit systems 4516046 (IE Cumulative) 4516067 (Monthly Rollup) Important Security Feature Bypass 4511872 4512488 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 8.1 for x64-based systems 4516046 (IE Cumulative) 4516067 (Monthly Rollup) Important Security Feature Bypass 4511872 4512488 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows RT 8.1 | 4516067 (Monthly Rollup) |
Important | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4516046 (IE Cumulative) 4516065 (Monthly Rollup) Low Security Feature Bypass 4511872 4512506 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2012 | 4516046 (IE Cumulative) |
Low | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows Server 2012 R2 4516046 (IE Cumulative) 4516067 (Monthly Rollup) Low Security Feature Bypass 4511872 4512488 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2016 | 4516044 (Security Update) |
Low | Security Feature Bypass | Yes |
| Internet Explorer 11 on Windows Server 2019 | 4512578 (Security Update) |
Low | Security Feature Bypass | Yes |
| Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 4516046 (IE Cumulative) 4516026 (Monthly Rollup) Low Security Feature Bypass 4511872 4512476 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 4516046 (IE Cumulative) 4516026 (Monthly Rollup) Low Security Feature Bypass 4511872 4512476 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 4516070 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 4516070 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 4516044 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 4516044 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 4516068 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 4516068 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 4516066 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems | 4516058 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems | 4512578 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems | 4515384 (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2016 | 4516044 (Security Update) |
Low | Security Feature Bypass | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2019 | 4512578 (Security Update) |
Low | Security Feature Bypass | Yes |
Patches
9 patches
| Article | Type | Restart |
|---|---|---|
4516070 |
Security Update | Yes |
4516044 |
Security Update | Yes |
4516068 |
Security Update | Yes |
4516066 |
Security Update | Yes |
4516058 |
Security Update | Yes |
4512578 |
Security Update | Yes |
4515384 |
Security Update | Yes |
4516067 |
Monthly Rollup | Yes |
4516046 |
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
Joshua Graham of TSS https://tsscyber.com.au
References
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