Description
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.
Nuclei Templates (1)
ESPHome - Authentication Bypass
HIGHVERIFIEDby sean-kim
Shodan:
http.title:"ESPHome"
Scores
CVSS v3
8.1
EPSS
0.0469
EPSS Percentile
89.4%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-303
Status
published
Products (2)
esphome/esphome_firmware
2025.8.0
pypi/esphome
0 - 2025.8.1PyPI
Published
Sep 02, 2025
Tracked Since
Feb 18, 2026