A newly discovered vulnerability in Windows' USB Video Class (UVC) driver has raised significant security concerns. Designated as CVE-2025-24055, this out-of-bounds read flaw could allow attackers to access sensitive system memory through malicious USB video devices.

Understanding CVE-2025-24055

The vulnerability exists in the Windows USB Video Class driver (usbvideo.sys), which handles communication between the OS and USB video devices like webcams. Microsoft has rated this as an Important severity issue with a CVSS score of 7.1, noting that successful exploitation could lead to:

  • Unauthorized memory access
  • Potential information disclosure
  • System instability
  • Possible privilege escalation in certain configurations

How the Vulnerability Works

The flaw occurs when processing specially crafted UVC control requests. An attacker could:

  1. Create a malicious USB video device
  2. Connect it to a target system
  3. Send malformed control requests
  4. Trigger an out-of-bounds read operation

This could allow reading kernel memory contents, potentially exposing sensitive data including:

  • System credentials
  • Encryption keys
  • Other protected memory contents

Affected Systems

Microsoft has confirmed the vulnerability affects:

  • Windows 10 versions 1809 through 22H2
  • Windows 11 versions 21H2 and 22H2
  • Windows Server 2019 and 2022

Mitigation Strategies

Microsoft has released patches through Windows Update. Administrators should:

  • Apply the latest security updates immediately
  • Restrict physical USB access to trusted devices
  • Consider disabling unnecessary USB video devices
  • Monitor for suspicious USB device connections

For systems that cannot be patched immediately, Microsoft recommends:

# Temporary registry workaround
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\usbflags" -Name "IgnoreHWSerNum" -Value 1

Detection and Monitoring

Security teams should watch for:

  • Unexpected USB video device connections
  • Multiple failed UVC driver requests
  • System crashes related to usbvideo.sys
  • Memory access violations in system logs

Long-Term Security Implications

This vulnerability highlights several ongoing challenges:

  • USB drivers remain a frequent attack vector
  • Physical access threats are often underestimated
  • Memory protection mechanisms need strengthening

Best Practices for USB Security

Organizations should implement:

  • USB device whitelisting
  • Endpoint detection for suspicious USB activity
  • Regular driver updates
  • Employee awareness training

Microsoft continues to investigate this vulnerability and may release additional guidance. System administrators should monitor the Microsoft Security Response Center for updates.