{"cve":"CVE-2020-12638","nvd":{"published":"2020-07-23T16:15:12.490","modified":"2026-06-17T02:52:02.963","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-287","CWE-319"],"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"],"products":["espressif:esp-idf","espressif:esp8266_nonos_sdk","espressif:esp8266_rtos_sdk"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-12638","score":0.0045,"percentile":0.39144,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}