CVE-2025-7213 Overview
CVE-2025-7213 affects the FNKvision FNK-GU2 IP camera through firmware version 40.1.7. The vulnerability exists in the device's Universal Asynchronous Receiver-Transmitter (UART) interface, which exposes an on-chip debug and test interface without proper access control [CWE-1191]. An attacker with physical access to the device can leverage the exposed UART pins to interact with the firmware and gain elevated access to the underlying system. The exploit has been publicly disclosed, increasing the risk that opportunistic actors will replicate the attack against deployed devices.
Critical Impact
Physical attackers can access debug interfaces on the FNK-GU2 camera board, potentially obtaining root-level access to the device firmware and any credentials or data stored on it.
Affected Products
- FNKvision FNK-GU2 IP camera
- Firmware versions up to and including 40.1.7
- Hardware exposing UART debug pins on the device board
Discovery Timeline
- 2025-07-09 - CVE-2025-7213 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-7213
Vulnerability Analysis
The FNK-GU2 exposes a UART debug interface on the physical circuit board without adequate access control. UART is a serial communication protocol commonly used during device manufacturing and firmware development to interact with the system console. When left accessible on production hardware, it becomes an attacker-usable entry point.
An attacker who opens the camera enclosure can attach probes or a serial-to-USB adapter to the exposed UART pads. Because the interface lacks authentication, the attacker can read bootloader output, interrupt the boot sequence, and interact with the underlying operating system shell. Public write-ups on this device describe reaching root access on the board through this path.
Exploitation requires physical possession of the device and hardware skills to identify pins, set the correct baud rate, and interact with the serial console. This raises attack complexity but does not eliminate risk for cameras deployed in accessible physical locations.
Root Cause
The root cause is a design-level failure classified under CWE-1191: On-Chip Debug and Test Interface With Improper Access Control. The debug interface remains active in production firmware and does not require authentication before granting console access.
Attack Vector
The attack vector is physical. An attacker must disassemble the FNK-GU2 camera, locate the UART pins on the board, and connect a serial adapter. Once connected, they can observe bootloader messages, drop into a bootloader or system shell, and enumerate stored credentials, configuration data, or Wi-Fi keys. Technical details are documented in the referenced Medium blog post on IoT hacking and VulDB entry #315162.
Detection Methods for CVE-2025-7213
Indicators of Compromise
- Physical tamper evidence on FNK-GU2 camera enclosures, including removed screws, pried seams, or exposed circuit boards
- Unexpected reboots or configuration changes on FNK-GU2 devices that could indicate serial console interaction
- New or modified user accounts on the camera device or associated cloud tenants
Detection Strategies
- Perform periodic physical inspection of deployed cameras for signs of enclosure tampering or attached wires
- Monitor camera network telemetry for anomalous outbound connections that may indicate a compromised device
- Correlate device configuration changes against expected administrative activity windows
Monitoring Recommendations
- Log and alert on authentication events and firmware version changes reported by FNK-GU2 devices
- Segment IoT camera traffic into a dedicated VLAN and monitor east-west flows for lateral movement attempts
- Track physical access to areas containing deployed cameras using badge or camera-of-cameras coverage
How to Mitigate CVE-2025-7213
Immediate Actions Required
- Inventory all FNKvision FNK-GU2 devices and identify those running firmware 40.1.7 or earlier
- Relocate cameras to physically secured mounting positions that prevent enclosure access
- Rotate any credentials, Wi-Fi keys, or API tokens that were provisioned to the affected devices
- Isolate FNK-GU2 devices on a restricted network segment with no direct access to sensitive systems
Patch Information
At the time of publication, no vendor patch is referenced in the NVD entry for CVE-2025-7213. Because the flaw is a hardware exposure of the UART debug interface, firmware updates alone may not fully close the attack surface. Consult the vendor for firmware guidance and any hardware revision that removes or disables the debug pins.
Workarounds
- Apply tamper-evident seals to camera enclosures to detect physical access attempts
- Deploy cameras in tamper-resistant housings or physically inaccessible mounting locations
- Where the deployment tolerates it, remove the affected devices and replace them with cameras that authenticate access to on-chip debug interfaces
- Ensure that credentials stored on the device are unique per unit so compromise of one camera does not expose the fleet
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
