Description
An encryption-bypass issue was discovered on Espressif ESP-IDF devices through 4.2, ESP8266_NONOS_SDK devices through 3.0.3, and ESP8266_RTOS_SDK devices through 3.3. Broadcasting forged beacon frames forces a device to change its authentication mode to OPEN, effectively disabling its 802.11 encryption.
References (4)
Core 4
Core References
Third Party Advisory x_refsource_misc
https://github.com/espressif/ESP8266_NONOS_SDK
Third Party Advisory x_refsource_misc
https://github.com/espressif/ESP8266_RTOS_SDK
Exploit, Patch, Third Party Advisory x_refsource_misc
https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors
Third Party Advisory x_refsource_misc
https://github.com/espressif/esp-idf
Scores
CVSS v3
6.8
EPSS
0.0047
EPSS Percentile
36.9%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Details
CWE
CWE-287
CWE-319
Status
published
Products (3)
espressif/esp-idf
< 4.2
espressif/esp8266_nonos_sdk
< 3.0.3
espressif/esp8266_rtos_sdk
< 3.3
Published
Jul 23, 2020
Tracked Since
Feb 18, 2026