ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2025-57808

ESPHome is a system to control microcontrollers remotely through Home Automation systems.

Published Sep 2, 2025 · catalog updated Oct 19, 2026 · esphome firmware

Open the advisory

Exploitation likelihood is not on this record for CVE-2025-57808. A missing EPSS score is not a low risk. Compare esphome firmware with the linked advisory before you change production.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
cpe esphome/esphome firmware

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe esphome/esphome firmware2025.8.0

How to fix CVE-2025-57808

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2025-57808. A missing EPSS score is not a low risk. Compare esphome firmware with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with esphome/esphome firmware 2025.8.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-303. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 2, 2025 · NIST NVD

    Detected

    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 an

  2. Oct 19, 2026 · NIST NVD

    Updated

    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 an

Sources

  • CVE.orgVulnerability recordCVE-2025-57808

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-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 subst

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 19, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.