Improper Input Validation in WF200 Firmware Divide-by-Zero Fault

Executive Summary

This vulnerability is an improper input validation flaw in the beacon handler of WF200 firmware versions 3.17.0 and earlier. It may cause a divide-by-zero fault, leading to a device crash and denial-of-service state until manually reset.

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Detection Guidance

Detecting this vulnerability requires monitoring for crashes or denial-of-service events in WF200 devices when processing Wi-Fi beacon frames. Check device logs for divide-by-zero faults or unexpected reboots. No specific commands are provided in the advisory, but network monitoring tools can detect abnormal traffic patterns from affected devices.

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Impact Analysis

The vulnerability can cause your WF200 Wi-Fi module to crash and become unresponsive, resulting in a denial-of-service until manually reset. This disrupts network connectivity and may require downtime to recover.

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Mitigation Strategies

Upgrade WF200 firmware to version 3.18.0 or later immediately. If upgrading is not possible, isolate affected devices from the network to prevent exploitation. Monitor for crashes or denial-of-service events as a sign of active exploitation.

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