CVE-2020-12638

6.8 mediumEPSS 0.4%

Medium (6.8) in espressif. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.8 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWEs: CWE-287, CWE-319
Published: 2020-07-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

espressif:esp-idf
espressif:esp8266_nonos_sdk
espressif:esp8266_rtos_sdk

References

https://github.com/espressif/ESP8266_NONOS_SDK
https://github.com/espressif/ESP8266_RTOS_SDK
https://github.com/espressif/esp-idf
https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors
https://github.com/espressif/ESP8266_NONOS_SDK

Check your stack JSON