CVE-2018-15478

Severity: high (CVSS 8.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-08-30 · updated 2026-06-17
Weakness: CWE-287

Description

An issue was discovered in myStrom WiFi Switch V1 before 2.66, WiFi Switch V2 before 3.80, WiFi Switch EU before 3.80, WiFi Bulb before 2.58, WiFi LED Strip before 3.80, WiFi Button before 2.73, and WiFi Button Plus before 2.73. The process of registering a device with a cloud account was based on an activation code derived from the device MAC address. By guessing valid MAC addresses or using MAC addresses printed on devices in shops and reverse engineering the protocol, an attacker would have been able to register previously unregistered devices to their account. When the rightful owner would have connected them after purchase to their WiFi network, the devices would not have registered with their account, would subsequently not have been controllable from the owner's mobile app, and would not have been visible in the owner's account. Instead, they would have been under control of the attacker.

Affected products

Mystrom Wifi Bulb Firmware: before 2.58 — fixed in 2.58
Mystrom Wifi Button Firmware: before 2.73 — fixed in 2.73
Mystrom Wifi Button Plus Firmware: before 2.73 — fixed in 2.73
Mystrom Wifi Led Strip Firmware: before 3.80 — fixed in 3.80
Mystrom Wifi Switch Eu Firmware: before 3.80 — fixed in 3.80
Mystrom Wifi Switch Firmware: before 2.66; before 3.80 — fixed in 2.66, 3.80

How to fix

Upgrade to a fixed version: Mystrom Wifi Bulb Firmware 2.58; Mystrom Wifi Button Firmware 2.73; Mystrom Wifi Button Plus Firmware 2.73; Mystrom Wifi Led Strip Firmware 3.80; Mystrom Wifi Switch Eu Firmware 3.80; Mystrom Wifi Switch Firmware 2.66, 3.80. Check the vendor advisory for mitigations.

References

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