VULNERABILITY INTELLIGENCE

CVE-2025-57808

CVSS score8.1 HIGH

EPSS probability1.54%

CISA KEVNot currently listed

Published2025-09-02

Last modified2026-10-19

CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

security-advisories@github.com: CWE-303
nvd@nist.gov: NVD-CWE-noinfo

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory