CVE-2021-40469: Windows DNS Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.2)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Publicly Disclosed

Yes

Patch Tuesday

2021-Oct

Released

2021-10-12

Last Updated

2022-02-02

EPSS Score

14.86% (percentile: 94.5%)

FAQ

If my server is not configured to be a DNS server, it is vulnerable? No, this vulnerability is only exploitable if the server is configured to be a DNS server.

Affected Products (18)

Windows

• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server, version 2004 (Server Core installation)
• Windows Server, version 20H2 (Server Core Installation)
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows Server 2008 for 32-bit Systems Service Pack 2
• Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 for x64-based Systems Service Pack 2
• Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (12)

• 5006672
• 5006699
• 5006670
• 5006669
• 5006736
• 5006715
• 5006743
• 5006728
• 5006739
• 5006732
• 5006714
• 5006729

Acknowledgments

<a href="https://twitter.com/0F1F0F1F">Shay Ber<a/>, <a href="https://twitter.com/guhe120">Yuki Chen</a>

Revision History

• 2021-10-12: Information published.
• 2022-02-02: Added acknowledgements. This is an informational change only.