OnlyPatch
Microsoft Windows

CVE-2019-0845 — Windows IOleCvt Interface Remote Code Execution Vulnerability

Critical CVSS 8.8 EPSS 0.14877 2019-04 archive

Executive Summary

A remote code execution vulnerability exists when the IOleCvt interface renders ASP webpage content. An attacker who successfully exploited the vulnerability could run malicious code remotely to take control of the user’s system. In a web-based attack scenario, an attacker could host a specially crafted website designed to exploit the vulnerability through Microsoft browsers and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The update addresses the vulnerability by correcting methods exposed when the IOleCvt interface is invoked.

Overview

8.8
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Apr 9 2019
Last Updated Apr 9 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.14877 — 0.96339 percentile
NVD CVSS 8.8 HIGH — differs from MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
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

0.14877
probability of exploitation in the next 30 days
0.96339 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

22 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 4493475 (Security Update) Critical Remote Code Execution Yes
Windows 10 for x64-based Systems 4493475 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 4493470 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 4493470 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1703 for 32-bit Systems 4493474 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1703 for x64-based Systems 4493474 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for 32-bit Systems 4493441 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for ARM64-based Systems 4493441 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for x64-based Systems 4493441 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for 32-bit Systems 4493464 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for ARM64-based Systems 4493464 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for x64-based Systems 4493464 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 4493509 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 4493509 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 4493509 (Security Update) Critical Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Critical Remote Code Execution 4489878 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 None Windows 7 for x64-based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Critical Remote Code Execution 4489878 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 None Windows 8.1 for 32-bit systems 4493446 (Monthly Rollup) 4493467 (Security Only) Critical Remote Code Execution 4489881 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 None Windows 8.1 for x64-based systems 4493446 (Monthly Rollup) 4493467 (Security Only) Critical Remote Code Execution 4489881 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 None Windows RT 8.1 4493446 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Critical Remote Code Execution 4489880 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 None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4493471 (Monthly Rollup) 4493458 (Security Only) Critical Remote Code Execution 4489880 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 None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Critical Remote Code Execution 4489880 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 None Windows Server 2008 for x64-based Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Critical Remote Code Execution 4489880 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 None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4493471 (Monthly Rollup) 4493458 (Security Only) Critical Remote Code Execution 4489880 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 None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Critical Remote Code Execution 4489878 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 None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Critical Remote Code Execution 4489878 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 None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4493472 (Monthly Rollup) 4493448 (Security Only) Critical Remote Code Execution 4489878 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 None Windows Server 2012 4493451 (Monthly Rollup) 4493450 (Security Only) Critical Remote Code Execution 4489891 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 None Windows Server 2012 (Server Core installation) 4493451 (Monthly Rollup) 4493450 (Security Only) Critical Remote Code Execution 4489891 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 None Windows Server 2012 R2 4493446 (Monthly Rollup) 4493467 (Security Only) Critical Remote Code Execution 4489881 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 None Windows Server 2012 R2 (Server Core installation) 4493446 (Monthly Rollup) 4493467 (Security Only) Critical Remote Code Execution 4489881 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 None Windows Server 2016 4493470 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 4493470 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 4493509 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 4493509 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1709 (Server Core Installation) 4493441 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1803 (Server Core Installation) 4493464 (Security Update) Critical Remote Code Execution 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

Acknowledgments

Yaniv Frank of SophosLabs

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