CVE-2026-4477 Overview
A cryptographic vulnerability has been identified in the Yi Technology YI Home Camera 2 firmware version 2.1.1_20171024151200. The flaw exists within the WPA/WPS component, where the device uses a hard-coded cryptographic key. An attacker with adjacent network access could potentially exploit this weakness to compromise the confidentiality of wireless communications.
Critical Impact
Use of hard-coded cryptographic keys in IoT devices can allow attackers on the local network to decrypt wireless traffic, potentially exposing sensitive video feeds and device communications.
Affected Products
- Yi Technology YI Home Camera 2 firmware version 2.1.1_20171024151200
- WPA/WPS component within affected firmware
Discovery Timeline
- 2026-03-20 - CVE CVE-2026-4477 published to NVD
- 2026-03-20 - Last updated in NVD database
Technical Details for CVE-2026-4477
Vulnerability Analysis
This vulnerability is classified under CWE-320 (Key Management Errors), which encompasses issues related to the improper handling of cryptographic keys. The affected YI Home Camera 2 device contains a hard-coded cryptographic key within its WPA/WPS wireless security implementation. Hard-coded keys are problematic because they cannot be changed by end users and are identical across all devices of the same model and firmware version.
The exploit has been publicly disclosed according to the vulnerability report. The vendor, Yi Technology, was contacted about this disclosure but did not respond. This lack of vendor response means no official patch is currently available.
Root Cause
The root cause is the use of a static, hard-coded cryptographic key embedded in the device firmware for WPA/WPS authentication. This is a common security anti-pattern in IoT devices where manufacturers embed fixed credentials or keys during development for convenience, but fail to implement proper key management that would allow unique keys per device or user-configurable credentials.
Attack Vector
The attack vector requires adjacent network access, meaning an attacker must be within wireless range of the target device. The attack is characterized as having high complexity due to the technical requirements for exploitation, including:
- Proximity to the target device's wireless network
- Ability to capture wireless traffic
- Knowledge of the hard-coded key value
- Technical capability to perform cryptographic operations with the extracted key
The vulnerability allows an attacker to potentially decrypt wireless communications if they can extract or determine the hard-coded key value from the firmware.
Detection Methods for CVE-2026-4477
Indicators of Compromise
- Unusual wireless traffic patterns around YI Home Camera 2 devices
- Evidence of firmware analysis or extraction attempts on the local network
- Unauthorized devices appearing on the same network segment as the camera
- Anomalous authentication attempts to the camera's WPA/WPS interface
Detection Strategies
- Monitor for unauthorized wireless access attempts targeting IoT devices
- Implement network segmentation to isolate IoT cameras from sensitive network segments
- Deploy wireless intrusion detection systems (WIDS) to identify suspicious wireless activity
- Conduct periodic firmware analysis to identify hard-coded credentials in IoT devices
Monitoring Recommendations
- Enable logging on network infrastructure devices to capture wireless authentication events
- Monitor for unusual traffic volumes originating from or destined to the camera device
- Implement real-time alerts for new devices joining the network segment containing the camera
- Review network traffic patterns for signs of traffic interception or man-in-the-middle activity
How to Mitigate CVE-2026-4477
Immediate Actions Required
- Isolate affected YI Home Camera 2 devices on a separate network segment with restricted access
- Implement additional network-level encryption (such as a VPN) for traffic involving the camera
- Restrict physical proximity access to areas where the camera's wireless signal is accessible
- Consider replacing affected devices with alternatives that support proper key management
Patch Information
No official patch is currently available from Yi Technology. The vendor was contacted regarding this vulnerability but did not respond. Users should monitor the VulDB entry and vendor communications for any future security updates.
Workarounds
- Place the camera on an isolated IoT network segment with strict firewall rules
- Use additional encryption layers such as VPN tunnels for accessing camera feeds
- Limit wireless signal propagation using physical barriers or directional antennas where possible
- Implement strong network access controls to prevent unauthorized devices from joining the camera's network segment
- Consider disabling WPS functionality if the device configuration allows it
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
