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CVE-2025-57808

ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header

ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome's web_server authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value. This allows access to web_server functionality (including OTA, if enabled) without knowing any information about the correct username or password. This issue has been patched in version 2025.8.1.

CVSS 3.1 · 8.1 High EPSS 1.5% KEV · Not listed
Vendors
Esphome
Products
Esphome Esphome Firmware
CVE-2021-41104

web_server allows OTA update without checking user defined basic auth username & password

ESPHome is a system to control the ESP8266/ESP32. Anyone with web_server enabled and HTTP basic auth configured on version 2021.9.1 or older is vulnerable to an issue in which `web_server` allows over-the-air (OTA) updates without checking user defined basic auth username & password. This issue is patched in version 2021.9.2. As a workaround, one may disable or remove `web_server`.

CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
Vendors
Esphome Espressif
Products
Esphome Firmware Esp32 Esp8266