CVE-2021-41104

HIGH

ESPHome < 2021.9.2 - Unauthenticated Over-the-Air Update via Web Server

Title source: llm
STIX 2.1

Description

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`.

References (3)

Core 3
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/esphome/esphome/releases/tag/2021.9.2

Scores

CVSS v3 7.5
EPSS 0.0118
EPSS Percentile 63.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-306
Status published
Products (2)
esphome/esphome_firmware < 2021.9.2
pypi/esphome 0 - 2021.9.2PyPI
Published Sep 28, 2021
Tracked Since Feb 18, 2026