IRONSMITHINTEL
MEDIUMCVSS5.4
|
Actively Exploited
|CISA KEV|CVE-2022-41091|Auth: none — unauthenticated|Reboot: required|Manual only

KB5019080: Windows Server Security Update (November 2022)

Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

Published Nov 9, 2022 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve partial data exposure, partial data tampering, partial service disruption. CISA has confirmed use of this vulnerability in known ransomware campaigns — treat as high priority for remediation. Federal agencies are required to remediate by 2022-12-09 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Incorrect Authorization (CWE-863) vulnerability in Microsoft Windows. Windows Mark of the Web Security Feature Bypass 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:

●Windows Administrators
●Systems Engineers
●IT Security
●Running windows 10 1507: v < 10.0.10240.19567; windows 10 1607: v < 10.0.14393.5501; windows 10 1809: v < 10.0.17763.3650; windows 10 20h2: v < 10.0.19042.2251; windows 10 21h1: v < 10.0.19043.2251; windows 10 21h2: v < 10.0.19044.2251; windows 10 22h2: v < 10.0.19045.2251; windows 11 21h2: v < 10.0.22000.1219; windows 11 22h2: v < 10.0.22621.819; windows server 2016: v < 10.0.14393.5501; windows server 2019: v < 10.0.17763.3650; windows server 2022: v < 10.0.20348.1249
Fixed inKB5019080, KB5019081, KB5019959, KB5019961, KB5019964, KB5019966, KB5019970, KB5019980 (applies to 28 product versions) — build 10.0.10240.19567, 10.0.14393.5501+
Real-world incidentsWhat we've seen

CISA confirms this CVE has been used in known ransomware campaigns. Added to the KEV catalog on 2022-11-08; federal agencies required to remediate by 2022-12-09.

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 CatalogKB5019080

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5019080 — https://support.microsoft.com/help/5019080
    1
    KB5019081 — https://support.microsoft.com/help/5019081
    1
    KB5019959 — https://support.microsoft.com/help/5019959
    1
    KB5019961 — https://support.microsoft.com/help/5019961
    1
    KB5019964 — https://support.microsoft.com/help/5019964
    1
    KB5019966 — https://support.microsoft.com/help/5019966
    1
    KB5019970 — https://support.microsoft.com/help/5019970
    1
    KB5019980 — https://support.microsoft.com/help/5019980

Supersedes: KB5018410, KB5018411, KB5018418, KB5018419, KB5018421, KB5018425, KB5018427

Affected Products

    1
    Windows 10 Version 1607 for 32-bit Systems
    1
    Windows 10 Version 1607 for x64-based Systems
    1
    Windows 10 Version 1809 for 32-bit Systems
    1
    Windows 10 Version 1809 for ARM64-based Systems
    1
    Windows 10 Version 1809 for x64-based Systems
    1
    Windows 10 Version 20H2 for 32-bit Systems
    1
    Windows 10 Version 20H2 for ARM64-based Systems
    1
    Windows 10 Version 21H1 for 32-bit Systems
    1
    Windows 10 Version 21H1 for ARM64-based Systems
    1
    Windows 10 Version 21H1 for x64-based Systems
    1
    Windows 10 Version 21H2 for 32-bit Systems
    1
    Windows 10 Version 21H2 for ARM64-based Systems
    1
    Windows 10 Version 21H2 for x64-based Systems
    1
    Windows 10 Version 22H2 for 32-bit Systems
    1
    Windows 10 Version 22H2 for ARM64-based Systems
    1
    Windows 10 Version 22H2 for x64-based Systems
    1
    Windows 10 for 32-bit Systems
    1
    Windows 10 for x64-based Systems
    1
    Windows 11 Version 22H2 for ARM64-based Systems
    1
    Windows 11 Version 22H2 for x64-based Systems
    1
    (…8 more product versions)

Fixed Build Numbers

    1
    10.0.10240.19567
    1
    10.0.14393.5501
    1
    10.0.17763.3650
    1
    10.0.19042.2251
    1
    10.0.19043.2251
    1
    10.0.19044.2251
    1
    10.0.19045.2251
    1
    10.0.20348.1249
    1
    10.0.20348.1251
    1
    10.0.22000.1219
    1
    (…1 more builds)

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 KB5019080
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 KB5019080 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5019081
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5019959
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5019961
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5019964
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5019966
    1
    (…2 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5019080','KB5019081','KB5019959','KB5019961','KB5019964','KB5019966','KB5019970','KB5019980') }

References

    1
    Microsoft Security Response Center: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-41091
    1
    KB article: https://support.microsoft.com/help/5019959
    1
    KB article: https://support.microsoft.com/help/5019966
    1
    KB article: https://support.microsoft.com/help/5019970
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2022-41091
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-41091
PowerShell automationComing soon

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

References

↗ CVE-2022-41091↗ MSRC Advisory↗ NVD↗ KBKB5019080