Password disclosure via nonconstant-time comparison
Published Aug 9, 2022 · Updated Aug 27, 2025
Information disclosure in Microsoft Defender Credential Guard allows local users to recover protected passwords on affected Windows builds. NtlmIumComparePasswordToProtectedPassword compares a plaintext candidate with an isolated encrypted password without constant-time behavior, creating a timing oracle. Exploitation requires local low-privileged access, Credential Guard use, and repeated high-complexity measurements; the demonstrated consequence is password disclosure.
Summary
What happened
Information disclosure in Microsoft Defender Credential Guard allows local users to recover protected passwords on affected Windows builds. NtlmIumComparePasswordToProtectedPassword compares a plaintext candidate with an isolated encrypted password without constant-time behavior, creating a timing oracle. Exploitation requires local low-privileged access, Credential Guard use, and repeated high-complexity measurements; the demonstrated consequence is password disclosure.
The record
- CVE
- CVE-2022-34704
- Published
- Aug 9, 2022
- Updated
- Aug 27, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-203, CWE-200, T1003
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 9, 2022CVE publishedPublication date reported by the CVE source.
- Aug 27, 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.
- Affected versionversion=10.0.10240.0 <10.0.10240.19387
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Windows Credential Guard Non-Constant Time Comparison Information Disclosureproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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