Bug 2392476 (CVE-2025-57808)

Summary: CVE-2025-57808 esphome: ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A vulnerability has been identified in ESPHome’s web_server component on the ESP-IDF platform where the HTTP basic authentication check (AsyncWebServerRequest::authenticate) can be bypassed. Due to incorrect comparison of the base64-encoded Authorization header value, authentication succeeds if the client provides either an empty string or a substring of the correct user:password credential. As a result, an attacker on the adjacent network can gain unauthorized access to web_server functionality — including over-the-air (OTA) firmware updates if enabled — without knowing valid credentials.
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Bug Depends On: 2392534, 2392535    
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Description OSIDB Bzimport 2025-09-02 01:01:09 UTC 
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.