CVE-2019-0835 — Microsoft Scripting Engine Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. In a web-based attack scenario, an attacker could host a website in an attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site. The security update addresses the vulnerability by changing how the scripting engine handles objects in memory.

Overview

6.5

CVSS MEDIUM

Low

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Apr 9 2019

Last Updated Apr 9 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06736 — 0.93246 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:H/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

0.06736

probability of exploitation in the next 30 days

0.93246 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

18 affected products

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

Yuki Chen of Qihoo 360 Vulcan Team

References

MSRC Advisory MITRE NVD