High severityNVD Advisory· Published Sep 2, 2025· Updated Sep 2, 2025
ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header
CVE-2025-57808
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
esphomePyPI | < 2025.8.1 | 2025.8.1 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-mxh2-ccgj-8635ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-57808ghsaADVISORY
- github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5ghsax_refsource_MISCWEB
- github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635ghsax_refsource_CONFIRMWEB
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