Description

A vulnerability has been found in Behavioral Technology Group Pavlok Behavioral Conditioning Wearable up to 20260707. Impacted is an unknown function of the component Apple Notification Center Service Event Handler. The manipulation leads to buffer overflow. The attack must be carried out from within the local network. The vendor was contacted early about this disclosure but did not respond in any way.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.6",
  "pubDate": "2026-09-10T00:17:24.737Z",
  "pubdate": "2026-09-10T00:17:24.737Z",
  "executiveSummary": "A buffer overflow vulnerability has been identified in the Behavioral Technology Group Pavlok Behavioral Conditioning Wearable, affecting versions up to 20260707.\nThe flaw resides within the Apple Notification Center Service (ANCS) event handler, which improperly manages input during notification processing.\nAn attacker positioned within the local network can exploit this memory corruption vulnerability to potentially achieve arbitrary code execution or cause a denial-of-service condition by triggering a system crash.\nThis vulnerability is critical due to the potential for unauthorized device manipulation. Successful exploitation necessitates proximity to the device, as the attack must be executed via the local network environment.\nDespite prior attempts at responsible disclosure, the vendor has failed to provide a response or remediation plan, leaving affected users exposed to potential exploitation.",
  "technicalDetails": "The vulnerability is a classic buffer overflow residing in the Apple Notification Center Service (ANCS) event handler component of the Pavlok wearable firmware. The flaw occurs during the parsing of incoming notification packets relayed from an Apple device to the wearable hardware.\nThe root cause of the vulnerability is the lack of adequate bounds checking when copying data from the ANCS event notification buffer into a fixed-size internal memory buffer within the handler function. When a specially crafted notification packet exceeds the allocated length of this buffer, the excess data overwrites adjacent memory addresses on the heap or stack, depending on the implementation.\nExploitation requires the attacker to be present within the local network, as the wearable maintains an active Bluetooth Low Energy (BLE) connection that facilitates the ANCS integration. The attack flow involves the adversary broadcasting or spoofing a malicious notification packet formatted to exceed the expected buffer dimensions. By meticulously crafting the payload, an attacker can overwrite critical control structures, such as function pointers or return addresses stored in the memory stack or heap.\nUpon successful overflow, the attacker gains the ability to redirect the program's execution flow to arbitrary memory locations. This could lead to the execution of malicious shellcode or the corruption of internal system states, effectively bypassing security controls. Given the nature of the device, post-exploitation impact includes the potential to intercept personal behavioral data, disrupt the conditioning functions of the wearable, or establish persistence on the device by modifying persistent configuration memory.\nThe vulnerability is confirmed in versions up to 20260707. No specific authentication or high-level privilege requirements are noted for the initiation of the packet injection, as the vulnerable ANCS handler blindly trusts the data structure provided by the connected source. The primary limitation for the attacker is the requirement for local network access to communicate with the device's BLE interface, which typically restricts the attack surface to the immediate vicinity of the wearable."
}