CVE-2025-4371 Overview
CVE-2025-4371 affects the Lenovo 510 FHD and Performance FHD web cameras. The vulnerability allows an attacker with physical access to write arbitrary firmware updates to the device over a Universal Serial Bus (USB) connection. The root cause is improper verification of cryptographic signatures on firmware images [CWE-347], enabling installation of unauthenticated firmware.
An attacker who can connect to the camera over USB can persistently modify device behavior at the firmware level. This creates a supply chain and hardware persistence risk that survives operating system reinstallation on the connected host.
Critical Impact
Physical-access attackers can flash arbitrary firmware to affected Lenovo web cameras, establishing persistent implants below the operating system layer.
Affected Products
- Lenovo 510 FHD Web Camera
- Lenovo Performance FHD Web Camera
- Firmware versions prior to the vendor-supplied fix referenced in Lenovo Security Advisory LEN-194466
Discovery Timeline
- 2025-08-18 - CVE-2025-4371 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-4371
Vulnerability Analysis
The vulnerability resides in the firmware update path exposed over the USB interface of the Lenovo 510 FHD and Performance FHD web cameras. The device firmware update routine accepts new firmware images without adequately verifying their cryptographic signature. An attacker can craft a modified firmware payload and deliver it through standard USB firmware update transactions.
Because the attack targets the device firmware itself, malicious code loaded through this path executes with full control over the camera's microcontroller. This grants the attacker the ability to manipulate video capture, exfiltrate frames, or use the peripheral as a launch point against the connected host.
Exploitation requires physical access to the camera or the ability to attach it to a system controlled by the attacker. The attack complexity is low once physical access is achieved, and no privileges or user interaction are required to complete the firmware write.
Root Cause
The defect is an Improper Verification of Cryptographic Signature weakness [CWE-347]. The firmware bootloader or update handler either omits signature validation or accepts firmware images signed with keys the attacker can produce. This design flaw breaks the chain of trust between the vendor and the shipped firmware.
Attack Vector
The attack vector is physical (AV:P). An adversary connects the target camera to a system under their control and issues a USB firmware update command carrying a malicious image. Attack scenarios include interdiction during shipping, tampering in shared workspaces, and malicious insiders with brief unattended access to a workstation.
Because no verified public code examples exist for this vulnerability, refer to the Lenovo Security Advisory LEN-194466 for technical details on the affected firmware update interface and remediated versions.
Detection Methods for CVE-2025-4371
Indicators of Compromise
- Unexpected firmware version strings reported by the affected Lenovo camera when queried through USB descriptors or vendor utilities
- USB device re-enumeration events occurring shortly after brief physical access windows to a workstation
- Anomalous camera behavior including unexpected LED activity, altered video framing, or new USB interface classes exposed by the device
Detection Strategies
- Inventory affected Lenovo 510 FHD and Performance FHD cameras across the fleet and record their reported firmware versions for baseline comparison
- Alert on new or unknown USB Vendor ID and Product ID combinations enumerating on managed endpoints, particularly composite device classes appearing where a simple UVC camera was previously present
- Correlate USB device change events with physical access logs from badge systems for high-risk workstations
Monitoring Recommendations
- Ingest Windows and Linux USB device connection telemetry into a centralized log platform for longitudinal analysis of peripheral changes
- Monitor endpoint detection and response (EDR) telemetry for processes interacting with the camera's HID or vendor-specific USB interface outside of expected firmware update windows
- Track firmware version drift by scheduling periodic queries against connected peripherals and flagging deviations from the approved version list
How to Mitigate CVE-2025-4371
Immediate Actions Required
- Apply the firmware update referenced in Lenovo Security Advisory LEN-194466 to all affected 510 FHD and Performance FHD web cameras
- Restrict physical access to workstations with attached cameras, especially in shared or public environments such as conference rooms and reception areas
- Audit procurement channels and validate firmware versions on newly received cameras before deploying them to users
Patch Information
Lenovo has published remediation guidance in Security Advisory LEN-194466. Administrators should download the vendor-supplied firmware update tool and flash affected devices to the fixed firmware version. Consult the advisory for the specific patched firmware build identifiers and update procedure.
Workarounds
- Disconnect affected cameras from endpoints when not in active use to reduce the window for physical tampering
- Enforce USB device control policies that block unapproved USB Vendor ID and Product ID combinations from enumerating on managed systems
- Replace affected units in high-risk locations with cameras from product lines not impacted by this advisory until patching is complete
# Example: enumerate connected USB video devices on Linux to baseline camera firmware
lsusb -v -d 17ef: 2>/dev/null | grep -E 'idProduct|iProduct|bcdDevice|iSerial'
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
