CVE-2021-27941

Name: CVE-2021-27941
Creator: NVD / NIST
Published: 2021-05-06T21:15:07.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.6/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2021-27941 is a medium-severity vulnerability rated 4.6/10 on the CVSS scale. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.6/10

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.21%

11.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Coolkit	Ewelink	<= 4.9.1
Coolkit	Ewelink	<= 4.9.2

References

https://apps.apple.com/us/app/ewelink-smart-home/id1035163158Product, Third Party Advisory
https://github.com/salgio/eWeLink-QR-CodeThird Party Advisory
https://play.google.com/store/apps/details?id=com.coolkit&hl=en_USProduct, Third Party Advisory
https://apps.apple.com/us/app/ewelink-smart-home/id1035163158Product, Third Party Advisory
https://github.com/salgio/eWeLink-QR-CodeThird Party Advisory
https://play.google.com/store/apps/details?id=com.coolkit&hl=en_USProduct, Third Party Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27941?

How severe is CVE-2021-27941?

CVE-2021-27941 has a CVSS score of 4.6/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27941?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27941?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST