CVE-2021-41104
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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`.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.21% probability · 67th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-306
- Affected
- esphome/esphome firmware
- Source
- security-advisories@github.com
References
- https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1ePatch, Third Party Advisory
- https://github.com/esphome/esphome/releases/tag/2021.9.2Release Notes, Third Party Advisory
- https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfmPatch, Third Party Advisory
- https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1ePatch, Third Party Advisory
- https://github.com/esphome/esphome/releases/tag/2021.9.2Release Notes, Third Party Advisory
- https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfmPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.