CVE-2019-0764 — Microsoft Browsers Tampering Vulnerability

Executive Summary

A tampering vulnerability exists when Microsoft browsers do not properly validate input under specific conditions. An attacker who exploited the vulnerability could pass custom command line parameters. In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or instant message. The security update addresses the vulnerability by correcting how Microsoft browsers validate input.

Overview

6.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Tampering

Released Apr 9 2019

Last Updated Apr 9 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03635 — 0.88355 percentile

NVD CVSS 6.5 MEDIUM — differs from MSRC

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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

Low

AVAILABILITY

Low

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.7

EPSS Score

0.03635

probability of exploitation in the next 30 days

0.88355 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

35 affected products

Product	KB Article	Severity	Impact	Restart Required
Internet Explorer 10 on Windows Server 2012 4493451 (Monthly Rollup) 4493435 (IE Cumulative) Low Tampering 4489891 4489873 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	`4493475 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 for x64-based Systems	`4493475 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems	`4493470 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems	`4493470 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems	`4493474 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems	`4493474 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4493472 (Monthly Rollup) 4493435 (IE Cumulative) Important Tampering 4489878 4489873 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 4493472 (Monthly Rollup) 4493435 (IE Cumulative) Important Tampering 4489878 4489873 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 4493446 (Monthly Rollup) 4493435 (IE Cumulative) Important Tampering 4489881 4489873 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 4493446 (Monthly Rollup) 4493435 (IE Cumulative) Important Tampering 4489881 4489873 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	`4493446 (Monthly Rollup)`	Important	Tampering	Yes
Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4493472 (Monthly Rollup) 4493435 (IE Cumulative) Low Tampering 4489878 4489873 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 R2 4493446 (Monthly Rollup) 4493435 (IE Cumulative) Low Tampering 4489881 4489873 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	`4493470 (Security Update)`	Low	Tampering	Yes
Internet Explorer 11 on Windows Server 2019	`4493509 (Security Update)`	Low	Tampering	Yes
Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 4493471 (Monthly Rollup) 4493435 (IE Cumulative) Low Tampering 4489880 4489873 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 4493471 (Monthly Rollup) 4493435 (IE Cumulative) Low Tampering 4489880 4489873 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	`4493475 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems	`4493475 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems	`4493470 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems	`4493470 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems	`4493474 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems	`4493474 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems	`4493441 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems	`4493464 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems	`4493509 (Security Update)`	Important	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2016	`4493470 (Security Update)`	Low	Tampering	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2019	`4493509 (Security Update)`	Low	Tampering	Yes

Patches

7 patches

Article	Type	Restart
`4493475`	Security Update	Yes
`4493470`	Security Update	Yes
`4493474`	Security Update	Yes
`4493441`	Security Update	Yes
`4493464`	Security Update	Yes
`4493509`	Security Update	Yes
`4493446`	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

Rio Sherri of MDSec
zemnmez Thomas Shadwell https://zemn.me

References

MSRC Advisory MITRE NVD