CVE-2021-41104

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    CVE-2021-41104

    Published: 28 Sept 2021Last Modified: 11 Feb 2026

    Summary:

    Details: 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: https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1e, https://github.com/esphome/esphome/releases/tag/2021.9.2, https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm, https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1e, https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -c83ecf764de8cee60ba586fedc6e2293a863e0c2

    Affected versions

    2021.8.0
    2021.8.1
    2021.8.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-41104 | CVE-DB