Proof-of-Concept (PoC) for CVE-2020-17103, an LPE in cldflt.sys. The issue is about the PoC's side effects and lack of clean uninstallation/reversion.
Raw Developer Origin & Technical Request
GitHub Issue
May 20, 2026
I was dumb enough to try this exploit on one of my devices I'm working on and now it's in semi-broken state. PoC left an error (sadly has not screenshooted it) probably due to OneDrive and possibly other cloud stuff were disabled beforehand using WinSlopR and/or WinScript
Opening cmd with Administrator priveleges now shows my C:\Users\AccountName path instead of C:\Windows\System32 and various system applications like services.msc now require UAC prompt for confirmation
Exploit was running from AccountName\Way folder which I now deleted
I searched registry for mentioning AccountName\Way folder and found those:
```
HKEY_USERS\S-1-5-21-1465610971-3362202562-1865175521-1001\Software\Policies\Microsoft\CloudFiles\BlockedApps\bc2c84844e3f4e32e1e3582d14a8dde13998dc8de306a2cf3d7573fbdb5d6cc ImagePath key with full path to PoC_AbortHydration_ArbitraryRegKey_EoP.exe
HKEY_CURRENT_USER\Software\Policies\Microsoft\CloudFiles\BlockedApps\bc2c84844e3f4e32e1e3582d14a8dde13998dc8de306a2cf3d7573fbdb5d6cc ImagePath key with full path to PoC_AbortHydration_ArbitraryRegKey_EoP.exe
HKEY_USERS\S-1-5-21-1465610971-3362202562-1865175521-1001\Software\Policies\Microsoft\CloudFiles\BlockedApps\bc2c84844e3f4e32e1e3582d14a8dde13998dc8de306a2cf3d7573fbdb5d6cc ImagePath key with full path to PoC_AbortHydration_ArbitraryRegKey_EoP.exe
HKEY_USERS\.DEFAULT\Volatile Environment windir key with C:\Users\AccountName\Downloads\Way path
HKEY_USERS\S-1-5-18\Volatile Environment windir key with C:\Users\Ac...
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