CVE-2021-27941

Severity Score

4.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

El acceso web sin restricciones a la clave de cifrado privada del dispositivo en el modo de emparejamiento de código QR en la aplicación móvil eWeLink (versiones hasta.9.2 en Android y versiones hasta.9.1 en iOS) permite a un atacante físicamente próximo espiar las credenciales de Wi-Fi y otras información mediante el seguimiento del espectro de Wi-Fi durante un proceso de emparejamiento de dispositivos

*Credits: N/A

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-03 CVE Reserved
2021-05-06 CVE Published
2024-08-03 CVE Updated
2025-03-10 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-522: Insufficiently Protected Credentials

CAPEC

References (3)

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

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Coolkit Search vendor "Coolkit"		Ewelink Search vendor "Coolkit" for product "Ewelink"				<= 4.9.1 Search vendor "Coolkit" for product "Ewelink" and version " <= 4.9.1"		iphone_os		Affected
Coolkit Search vendor "Coolkit"		Ewelink Search vendor "Coolkit" for product "Ewelink"				<= 4.9.2 Search vendor "Coolkit" for product "Ewelink" and version " <= 4.9.2"		android		Affected