CVE-2025-57808

02.09.2025, 01:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	8.1 HIGH	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M	CNA	8.1 HIGH	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA-ADP	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 88%

Vendor	Product	Version
esphome	esphome_firmware	2025.8.0

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= Vulnerable software versions

Known Exploits!

Common Weakness Enumeration

CWE-303 - Incorrect Implementation of Authentication Algorithm
The requirements for the software dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

References

https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5

https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635