CVE-2025-57808

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of data exposure, data tampering.

Exploit odds

1.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-09-02 01:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-19 17:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.5% in the next 30 days (EPSS).
• Severity: 8.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2025-09-02 01:15 UTC

Last modified

2026-10-19 17:10 UTC

Exploit probability

1.5% · EPSS, next 30 days

Weakness

CWE-303

Record status

Analyzed

Affected

• Esphome Firmware 2025.8.0

Attack profile CVSS 3.1 · 8.1

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-57808.md and follow it. Check whether this project is affected by CVE-2025-57808. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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