CVE-2020-12638

low-risk
Published 2020-07-23

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.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.8/10 Medium
ADJACENT_NETWORK / HIGH complexity

Affected Products (3)

Esp8266 Nonos Sdk
Esp8266 Rtos Sdk

Affected Vendors

Espressif

References (8)

Third Party Advisory https://github.com/espressif/ESP8266_NONOS_SDK
Third Party Advisory https://github.com/espressif/ESP8266_RTOS_SDK
Third Party Advisory https://github.com/espressif/esp-idf
Exploit https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microproc...
Third Party Advisory https://github.com/espressif/ESP8266_NONOS_SDK
Third Party Advisory https://github.com/espressif/ESP8266_RTOS_SDK
Third Party Advisory https://github.com/espressif/esp-idf
Exploit https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microproc...
27
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 9/34 · Low