What’s Vulnerable › Vulnerabilities

CVE-2020-11005: Internal NCryptDecrypt method could be used externally from WindowsHello library.

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-14 · updated 2026-06-17
• Weakness: CWE-288

Description

The WindowsHello open source library (NuGet HaemmerElectronics.SeppPenner.WindowsHello), before version 1.0.4, has a vulnerability where encrypted data could potentially be decrypted without needing authentication. If the library is used to encrypt text and write the output to a txt file, another executable could be able to decrypt the text using the static method NCryptDecrypt from this same library without the need to use Windows Hello Authentication again. This has been patched in version 1.0.4.

Affected products

• SeppPenner WindowsHello: before 1.0.4 — fixed in 1.0.4

How to fix

Upgrade to a fixed version: SeppPenner WindowsHello 1.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/SeppPenner/WindowsHello/issues/3
• https://github.com/SeppPenner/WindowsHello/security/advisories/GHSA-wvpv-ffcv-r6cw
• https://github.com/SeppPenner/WindowsHello/issues/3
• https://github.com/SeppPenner/WindowsHello/security/advisories/GHSA-wvpv-ffcv-r6cw

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