CVE-2025-6521: Sight Bulb Pro Information Disclosure Flaw

CVE-2025-6521 Overview

CVE-2025-6521 affects the Trend Makers Sight Bulb Pro smart lighting device during its initial setup process. The device broadcasts a Wi-Fi access point that the management application connects to for provisioning. During the setup negotiation, the device transmits AES encryption keys in cleartext over this wireless channel. An attacker within radio range can capture the exchange and decrypt subsequent communications between the management app and the Sight Bulb Pro. Decrypted traffic may expose sensitive information including Wi-Fi network credentials used to onboard the device. This weakness is tracked under CWE-327: Use of a Broken or Risky Cryptographic Algorithm because the key exchange lacks any confidentiality protection.

Critical Impact
Adjacent-network attackers can passively capture cleartext AES keys during Sight Bulb Pro setup and decrypt subsequent traffic, exposing Wi-Fi credentials and device configuration data.

Affected Products

Trend Makers Sight Bulb Pro (initial setup / provisioning flow)
Sight Bulb Pro management mobile application
Any Wi-Fi network whose credentials are shared with the device during onboarding

Discovery Timeline

2025-06-27 - CVE-2025-6521 published to NVD
2025-06-27 - CISA ICS Advisory ICSA-25-177-02 released
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-6521

Vulnerability Analysis

The Sight Bulb Pro performs its initial pairing over a device-hosted Wi-Fi access point. The mobile management application joins this access point and exchanges provisioning data with the bulb. As part of that exchange, the device negotiates an AES symmetric key that is intended to protect later communications. The negotiation transmits the AES key material in cleartext with no key wrapping, no Diffie-Hellman exchange, and no transport-layer encryption. Any attacker within Wi-Fi range of the setup access point can capture the frames using a passive monitor. Once the attacker holds the AES key, they can decrypt all subsequent traffic between the application and the device. That decrypted traffic includes the home Wi-Fi Service Set Identifier (SSID) and pre-shared key that the user submits to onboard the bulb.

Root Cause

The root cause is a design flaw in the provisioning protocol. The vendor relies on the confidentiality of a temporary setup access point rather than performing an authenticated key agreement. Sending long-term symmetric keys over an unauthenticated channel violates standard secure-pairing patterns such as Elliptic Curve Diffie-Hellman with authenticated commitments.

Attack Vector

The attack requires adjacent network access, specifically Wi-Fi radio range of the device during its brief setup window. The attacker runs a wireless adapter in monitor mode on the channel used by the Sight Bulb Pro access point. When a legitimate user initiates provisioning, the attacker captures the handshake containing the cleartext AES key. The attacker then decrypts follow-on frames offline and extracts network credentials or other configuration data. No credentials, prior compromise, or user interaction with the attacker is required beyond proximity.

Because no verified proof-of-concept has been published, technical details are documented in the CISA ICS Advisory ICSA-25-177-02 rather than reproduced here.

Detection Methods for CVE-2025-6521

Indicators of Compromise

Unexpected client stations associated to a Sight Bulb Pro setup access point during provisioning windows.
Wi-Fi monitor-mode adapters or capture tools observed on the same channel as the device during onboarding.
Unexplained changes to home Wi-Fi credentials or unauthorized devices joining the network after a bulb setup event.

Detection Strategies

Perform periodic wireless surveys during device onboarding to identify rogue clients within range of the setup SSID.
Correlate IoT provisioning events with wireless intrusion detection system (WIDS) alerts for probe-request floods or deauthentication activity.
Baseline the MAC addresses that associate to IoT provisioning networks and alert on unknown stations.

Monitoring Recommendations

Log DHCP and association events on the guest or IoT VLAN and forward them to a centralized logging platform for review.
Monitor the IoT network segment for unexpected outbound traffic from newly provisioned Sight Bulb Pro devices.
Track Wi-Fi credential changes and re-provisioning attempts, which may indicate an attacker replayed captured configuration data.

How to Mitigate CVE-2025-6521

Immediate Actions Required

Perform Sight Bulb Pro initial setup in a physically controlled location with minimal Wi-Fi coverage to reduce eavesdropping range.
Provision devices on a dedicated IoT SSID that does not share credentials with primary corporate or home networks.
Rotate any Wi-Fi pre-shared keys that were entered into the Sight Bulb Pro application during a previous setup in an untrusted environment.
Contact the vendor via Trend Makers Customer Service for firmware update availability.

Patch Information

No vendor patch is referenced in the NVD entry or the CISA advisory at the time of publication. Consult CISA ICS Advisory ICSA-25-177-02 for the current remediation status and any updated vendor guidance.

Workarounds

Segment IoT devices onto an isolated VLAN with no route to sensitive internal networks or management interfaces.
Use a throwaway Wi-Fi SSID and pre-shared key dedicated to Sight Bulb Pro provisioning, then remove or rotate it after setup completes.
Disable and unpair Sight Bulb Pro devices that were provisioned in shared or high-density wireless environments until firmware guidance is available.
Restrict physical and RF access to the provisioning area during onboarding to reduce the window in which capture is possible.

bash

# Example: create an isolated IoT VLAN and SSID (vendor-neutral)
# Replace interface names and credentials to match your environment.
vconfig add eth0 40
ip addr add 192.0.2.1/24 dev eth0.40
iptables -A FORWARD -i eth0.40 -o eth0.10 -j DROP   # block IoT -> LAN
iptables -A FORWARD -i eth0.40 -o eth0.40 -j ACCEPT # allow intra-IoT