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CVE-2021-41104

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Date: September 28, 2021

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`.

Language: C++

Severity Score

Related Resources (10)

https://nvd.nist.gov/vuln/detail/CVE-2021-41104
https://github.com/pypa/advisory-database/tree/main/vulns/esphome/PYSEC-2021-351.yaml
https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1e
https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm
https://github.com/esphome/esphome/commit/2234f6aacf8cc653307fed80f3750317a82c4f83
https://github.com/esphome/esphome/pull/2409
https://github.com/esphome/esphome
https://github.com/esphome/esphome/commit/be965a60eba6bb769e2a5afdbc8eed132f077a59
https://github.com/esphome/esphome/releases/tag/2021.9.2
https://www.mend.io/vulnerability-database/CVE-2021-41104

Severity Score

Weakness Type (CWE)

Missing Authentication for Critical Function

CWE-306

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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