Scfilter Cid87d25e32ac0d4ef0b1e0502c6b7dfb77 Patched !new! -

(String Value): Set to Microsoft Smart Card Key Storage Provider .

When explicit hardware tokens require the missing driver interface to operate authentication tunnels, downloading a verified driver package directly is necessary:

this device ID via Group Policy. Smart card basic troubleshooting - Yubico Support

Open the policy .

When a smart card or cryptographic token is plugged into a USB port, the Windows Plug and Play (PnP) manager reads its unique identification string. For many generic smart cards, identity tokens, and multi-factor authentication (MFA) keys, Windows generates a hardware ID starting with SCFILTER\CID_ followed by a specific hexadecimal string.

: This is a default Microsoft kernel-mode driver ( scfilter.sys ) that acts as an Upper Filter driver. Its job is to monitor Smart Card readers, read the Answer to Reset (ATR) string from an inserted card, and try to match it against known minidrivers in the Windows Registry so the card can function seamlessly.

( SCardSvr ) is running and set to Trigger Start / Automatic. Manually start the service and check for dependencies. Security Log Audit scfilter cid87d25e32ac0d4ef0b1e0502c6b7dfb77 patched

The string "scfilter cid87d25e32ac0d4ef0b1e0502c6b7dfb77 patched"

: Confirm your system is running the latest security patches for Windows Cryptographic Services to ensure scfilter.sys is protected. If you'd like, I can help you: Analyze a specific log file where this ID appeared.

Because scfilter.sys interacts directly with kernel memory and hardware cryptography, aggressive endpoint detection systems—like Norton Power Eraser, Windows Defender, or CrowdStrike—occasionally flag it. A heuristic scan might label the driver or its associated registry path as a rootkit threat. When the security software clears or whitelists the file, it registers the event as "patched" or "remediated". Broken Printing and Authentication Services (String Value): Set to Microsoft Smart Card Key

: This indicates that the filter or the component identified by the cid has been modified or updated in some way. In software development, a "patch" is a set of changes or fixes applied to a software product. The term here suggests that the filter has been altered from its original state.

If the error recurs after a system update or restart, check the on your network. Corporate environments often deploy restrictive policies under Computer Configuration -> Administrative Templates -> System -> Device Installation -> Device Installation Restrictions that block the dynamic creation of custom smart card classes. Work with your IT systems administrator to exclude the SCFILTER device class from aggressive endpoint privilege blocks.

[Smart Card / Token Insertion] │ ▼ [scfilter.sys (Smart Card Filter Driver)] ◄── Identifies unique CID (e.g., CID_87D25E32...) │ ▼ [Windows Smart Card Resource Manager] ───► Passes tokens to Apps (VPN, Windows Hello, Browser) 1. The Role of scfilter.sys When a smart card or cryptographic token is

Security researchers or vendors patched a vulnerability (such as a buffer overflow or logic flaw) inside the specific card minidriver or reader driver that could allow local privilege escalation. Technical Specifications: The scfilter Subsystem Driver Component scfilter.sys (Windows Smart Card PnP Filter Driver) Hardware ID Syntax SCFILTER\CID_87D25E32-AC0D-4EF0-B1E0-502C6B7DFB77 Typical Deployment

The first part of the keyword is scfilter . In the Windows operating system, scfilter.sys is a critical system driver (a kernel-mode driver) known as the .