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

Category Security Feature Bypass

Released Sep 10 2019

Last Updated Sep 10 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03559 — 0.87834 percentile

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

Temporal Score: 3.9

EPSS Score

0.03559

probability of exploitation in the next 30 days

0.87834 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

51 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	Yes
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	Yes
Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1	`4516046 (IE Cumulative) 4516065 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 8.1 for 32-bit systems	`4516046 (IE Cumulative) 4516067 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 8.1 for x64-based systems	`4516046 (IE Cumulative) 4516067 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
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	Yes
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	Yes
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	Yes
Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2	`4516046 (IE Cumulative) 4516026 (Monthly Rollup)`	Low	Security Feature Bypass	Yes
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

13 patches

Article	Type	Restart
`4516055 (Monthly Rollup) 4516046`	Monthly Rollup	Yes
`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
`4516046 (IE Cumulative) 4516065`	IE Cumulative	Yes
`4516046 (IE Cumulative) 4516067`	IE Cumulative	Yes
`4516067`	Monthly Rollup	Yes
`4516046`	IE Cumulative	Yes
`4516046 (IE Cumulative) 4516026`	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

MSRC Advisory MITRE NVD