What is the CVSS score of CVE-2025-57808?

CVE-2025-57808 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 6.2%.

Which versions of Esphome are affected by CVE-2025-57808?

Organizations using ESPHome face notable risk from CVE-2025-57808 rated CVSS 8.1. Successful exploitation could significantly impact the confidentiality, integrity, or availability of affected…. A patch is available.

Is there a public PoC exploit available for CVE-2025-57808?

Yes, a public proof-of-concept exploit is available for CVE-2025-57808. Prioritise patching immediately. EPSS: 6.2%.

How to fix or mitigate CVE-2025-57808?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

Esphome CVE-2025-57808

HIGH

Incorrect Implementation of Authentication Algorithm (CWE-303)

2025-09-02 security-advisories@github.com

Information Disclosure Esphome Esphome Firmware

8.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.1 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:10 vuln.today

Patch released

Mar 28, 2026 - 19:10 nvd

Patch available

PoC Detected

Sep 10, 2025 - 19:03 vuln.today

Public exploit code

CVE Published

Sep 02, 2025 - 01:15 nvd

HIGH 8.1

DescriptionGitHub Advisory

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.

AnalysisAI

ESPHome is a system to control microcontrollers remotely through Home Automation systems. Rated high severity (CVSS 8.1), this vulnerability is no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-303. 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. Affected products include: Esphome Esphome Firmware. Version information: version 2025.8.0.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.