CVE-2025-57808: esphome firmware — Exploit & Fix

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.

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CVSS v3.1 Score

8.1

HIGH

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

Weakness Type (CWE)

CWE-303 CWE-303

Affected Products

Vendor	Product	Versions
esphome	esphome_firmware	All

References

Advisories & Patches

https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5 https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635 https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635

Exploits

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

Frequently Asked Questions

What is CVE-2025-57808? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-57808? +

CVE-2025-57808 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-57808? +

CVE-2025-57808 affects products from esphome, specifically: esphome_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-57808? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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