CVE-2022-21984Network attack vector

Authenticated remote code execution

Published Feb 9, 2022 · Updated Jan 2, 2025

Remote code execution in Microsoft Windows DNS Server allows remote authenticated users to execute code via dynamic DNS updates. Microsoft has not published the specific DNS update parsing or processing operation that mishandles attacker-controlled data. A target must run an affected Windows build as a DNS server with dynamic updates enabled; successful exploitation executes code in the DNS service context.

CVSS severity8.8
High
EPSS probability4.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Windows DNS Server allows remote authenticated users to execute code via dynamic DNS updates. Microsoft has not published the specific DNS update parsing or processing operation that mishandles attacker-controlled data. A target must run an affected Windows build as a DNS server with dynamic updates enabled; successful exploitation executes code in the DNS service context.

The record

CVE
CVE-2022-21984
Published
Feb 9, 2022
Updated
Jan 2, 2025
Vendor
Microsoft
Product
Windows 10 Version 21H1
Classifications
T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <10.0.19043.1526

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 21H1version=10.0.0 <10.0.19043.1526
Microsoft · Windows 10 Version 1909version=10.0.0 <10.0.18363.2094
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.493
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.1526
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.1526
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1526
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.524

Published CVSS scores

6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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