VulnerabilityAnalyzed

CVE-2025-57808

ESPHome is a system to control microcontrollers remotely through Home Automation systems.

HIGH 8.1EPSS 1.57%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.57%). 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 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.

CVSS 3.1: 8.1 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 1.57% probability · 74th percentile
CISA KEV: Not listed
Weakness: CWE-303
Affected: esphome/esphome firmware
Source: security-advisories@github.com

References

https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5Patch
https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635Exploit, Vendor Advisory
https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635Exploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.