CVE-2021-27941: Coolkit Ewelink

Medium severity, CVSS 4.6. EPSS: 0.2% chance of exploitation in the next 30 days.

Unconstrained Web access to the device's private encryption key in the QR code pairing mode in the eWeLink mobile application (through 4.9.2 on Android and through 4.9.1 on iOS) allows a physically proximate attacker to eavesdrop on Wi-Fi credentials and other sensitive information by monitoring the Wi-Fi spectrum during a device pairing process.

Affected products

• Coolkit Ewelink: up to and including 4.9.1; up to and including 4.9.2

Published 2021-05-06. Last modified 2026-06-17.