CVE-2021-27941

Severity: medium (CVSS 4.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-522

Description

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: through 4.9.1; through 4.9.2

References

https://apps.apple.com/us/app/ewelink-smart-home/id1035163158
https://github.com/salgio/eWeLink-QR-Code
https://play.google.com/store/apps/details?id=com.coolkit&hl=en_US
https://apps.apple.com/us/app/ewelink-smart-home/id1035163158
https://github.com/salgio/eWeLink-QR-Code
https://play.google.com/store/apps/details?id=com.coolkit&hl=en_US

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