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CVE-2020-12638

MEDIUM
6.8
CVSS Score
Published: July 23, 2020 at 03:41 PM UTC
Updated: June 17, 2026 at 02:52 AM UTC
3 products affected across 1 vendorEsp IdfESP8266 Nonos SDKESP8266 RTOS SDK

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/espressif/ESP8266_NONOS_SDK
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/espressif/ESP8266_RTOS_SDK
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/espressif/esp-idf
x_refsource_MISCExploitPatchThird Party Advisory
Source: [email protected]
https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors

CVSS

6.8MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287CWE-319

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