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TI-2020-08879 Aliases CVE-2020-11005GHSA-wvpv-ffcv-r6cw

Internal NCryptDecrypt method could be used externally from WindowsHello library.

Priority LOW 24CWE-288Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass, Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-288 and CWE-327.

Summary

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.

Why it matters now

EPSS 0.00234 14th percentileScored 2026-11-07
Fix Fixed WindowsHello (SeppPenner): 1.0.4HaemmerElectronics.SeppPenner.WindowsHello (NuGet): 1.0.4

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
SeppPennerWindowsHellobefore 1.0.41.0.4Patch availableCNA
—HaemmerElectronics.SeppPenner.WindowsHello (NuGet)before 1.0.41.0.4Patch availableGHSA-wvpv-ffcv-r6cw
  • WindowsHello VendorSeppPenner Affected before 1.0.4 Fixed in 1.0.4 Patch available CNA
  • HaemmerElectronics.SeppPenner.WindowsHello (NuGet) Vendor— Affected before 1.0.4 Fixed in 1.0.4 Patch available GHSA-wvpv-ffcv-r6cw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:windowshello_project:windowshello:*:*:*:*:*:*:*:*before 1.0.4VulnerableWindowshello Project
  • cpe:2.3:a:windowshello_project:windowshello:*:*:*:*:*:*:*:* Versions before 1.0.4 Vulnerable ·Windowshello Project

Remediation

  • Fix · CNA WindowsHello (SeppPenner) Fixed in 1.0.4
  • Fix · GHSA-wvpv-ffcv-r6cw HaemmerElectronics.SeppPenner.WindowsHello (NuGet) Fixed in 1.0.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-11005
  2. 2026-10-03 Alias added: GHSA-wvpv-ffcv-r6cw

References

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences