Vulnerability in Esphome
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: +0.000
Affected products
- Esphome — versions = 2025.8.0
- Esphome Firmware — versions 2025.8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635 (Exploit, Vendor Advisory)
- github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5 (Patch)
Frequently asked questions
- What is CVE-2025-57808?
- CVE-2025-57808 is a high-severity vulnerability in Esphome, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.1/10. Published 2025-09-02.
- How severe is CVE-2025-57808?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2025-57808 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.