CVE-2020-12638

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.

CVSS v3.1 NVD

6.8 MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2.0 NVD

4.3 MEDIUMAV:A/AC:M/Au:N/C:P/I:P/A:N

EPSS

0.45% chance of exploitation in the next 30 days, 38th percentile

Published

2020-07-23

Updated

2024-08-04

Proof-of-concept exploits (1)

• https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors

Security advisories

• espressif/ESP8266_NONOS_SDK
• espressif/ESP8266_RTOS_SDK
• espressif/esp-idf

References

• CVE Record
• NVD entry