IRONSMITHINTEL
MEDIUMCVSS6.5
|
Actively Exploited
|CISA KEV|CVE-2019-0676|Auth: none — unauthenticated|Reboot: required|Manual only

KB4486474: Windows Server Security Update (March 2019)

An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited this vulnerability could test for the presence of files on disk.

Published Mar 5, 2019 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss. Federal agencies are required to remediate by 2022-06-13 under CISA BOD 22-01.

How the attack worksNo clicks needed

This vulnerability affects Microsoft Internet Explorer. An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory.An attacker who successfully exploited this vulnerability could test for the presence of files on disk, aka 'Internet Explorer Information Disclosure Vulnerability'. Exploitation requires remote network access, low attack complexity, no authentication required, and user interaction required.

📧

Phishing link

→

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security
●Running internet explorer: 10, 11
Fixed inKB4486474, KB4486563, KB4486996, KB4487000, KB4487017, KB4487018, KB4487020, KB4487025, KB4487026, KB4487044 (applies to 25 product versions)
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2022-05-23 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2022-06-13.

How to patch

Manual download

For air-gapped servers or out-of-band deployment. Microsoft Update Catalog returns every OS-version variant of this update.

↗ Microsoft Update CatalogKB4486474

Manual remediation steps

Apply the Microsoft Security Update

Microsoft has released an official security update that fixes this vulnerability.

Required KB Updates

    1
    KB4486474 — https://support.microsoft.com/help/4486474
    1
    KB4486563 — https://support.microsoft.com/help/4486563
    1
    KB4486996 — https://support.microsoft.com/help/4486996
    1
    KB4487000 — https://support.microsoft.com/help/4487000
    1
    KB4487017 — https://support.microsoft.com/help/4487017
    1
    KB4487018 — https://support.microsoft.com/help/4487018
    1
    KB4487020 — https://support.microsoft.com/help/4487020
    1
    KB4487025 — https://support.microsoft.com/help/4487025
    1
    KB4487026 — https://support.microsoft.com/help/4487026
    1
    KB4487044 — https://support.microsoft.com/help/4487044

Supersedes: KB4480116, KB4480961, KB4480962, KB4480963, KB4480965, KB4480966, KB4480970, KB4480973, KB4480978

Affected Products

    1
    Internet Explorer 10 on Windows Server 2012
    1
    Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems
    1
    Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems
    1
    Internet Explorer 11 on Windows 10 for 32-bit Systems
    1
    Internet Explorer 11 on Windows 10 for x64-based Systems
    1
    Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1
    1
    Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1
    1
    Internet Explorer 11 on Windows 8.1 for 32-bit systems
    1
    Internet Explorer 11 on Windows 8.1 for x64-based systems
    1
    (…5 more product versions)

Installation Methods

Windows Update (recommended)

1
Settings → Windows Update → Check for updates
2
The security update is offered if your system is in scope
3
Restart when prompted — a reboot IS required to complete the install

Microsoft Update Catalog (manual download)

1
Open https://catalog.update.microsoft.com
2
Search for KB4486474
3
Download the package matching your OS architecture and Windows build
4
Run the .msu installer with administrator privileges
5
Restart when prompted

WSUS / SCCM / Intune

Approve KB4486474 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4486474
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4486563
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4486996
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4487000
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4487017
    1
    (…5 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB4486474','KB4486563','KB4486996','KB4487000','KB4487017','KB4487018','KB4487020','KB4487025','KB4487026','KB4487044') }

References

    1
    Microsoft Security Response Center: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0676
    1
    KB article: https://support.microsoft.com/help/4486474
    1
    KB article: https://support.microsoft.com/help/4486563
    1
    KB article: https://support.microsoft.com/help/4486996
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2019-0676
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0676

Discovery Credit

Clement Lecigne of Google’s Threat Analysis Group

PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2019-0676↗ MSRC Advisory↗ NVD↗ KBKB4486474