CVE-2022-34712Public exploit

Kerberos key disclosure via unchecked encryption type

Published Aug 9, 2022 · Updated May 29, 2025

Information disclosure in Microsoft Windows Defender Credential Guard allows local users to read Kerberos-protected key material. KerbIumGetNtlmSupplementalCredential fails to verify the requested encryption-key type before returning a supplemental credential, exposing key bytes across the isolated trust boundary. Exploitation requires low-privileged local code execution and targeted data held by Credential Guard; integrity and availability are unaffected.

CVSS severity5.5
Medium
EPSS probability1.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Microsoft Windows Defender Credential Guard allows local users to read Kerberos-protected key material. KerbIumGetNtlmSupplementalCredential fails to verify the requested encryption-key type before returning a supplemental credential, exposing key bytes across the isolated trust boundary. Exploitation requires low-privileged local code execution and targeted data held by Credential Guard; integrity and availability are unaffected.

The record

CVE
CVE-2022-34712
Published
Aug 9, 2022
Updated
May 29, 2025
Vendor
Microsoft
Product
Windows 10 Version 21H1
Classifications
CWE-200, T1003
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 9, 2022CVE publishedPublication date reported by the CVE source.
  2. May 29, 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 <10.0.19043.1889

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 21H1version=10.0.0 <10.0.19043.1889
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.856
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.1889
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.1889
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1889
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.887

Published CVSS scores

5.5MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1003OS Credential Dumping

Public exploit references

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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