CVE-2025-57808

Name: CVE-2025-57808
Creator: NVD / NIST
Published: 2025-09-02T01:15:29.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.51%

Last modified Jun 17, 2026

CVE-2025-57808 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 1.51% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

1.51%

71.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-303

Affected Software

Vendor	Product	Versions
Esphome	Esphome Firmware	2025.8.0

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

Timeline

Published: Sep 2, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-57808?

How severe is CVE-2025-57808?

CVE-2025-57808 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.51% probability of exploitation in the next 30 days.

How do I fix CVE-2025-57808?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-57808?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST