November 14, 2026

CVE Watchtower

CVE-2025-57808Esphome Esphome Firmware

NVDCVSS scored by security-advisories@github.com

Vulnerability Summary

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.
Severity Level
HIGH(8.1)
Published Date
Sep 2, 2025
Last Modified
Oct 19, 2026
PoC
Available(Nuclei)
Exploitation Status
Public exploit available
EPSS Score (30-Day)
1.54%Probability
Root Weakness (CWE)
CWE-303 β†—
See the MITRE CWE entry for the full definition of this weakness.
CVSS v3.1 Base Metrics — Score 8.1 (HIGH)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack VectorAdjacent
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Esphome Esphome Firmware
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Prioritize this fix. Exploit code is public, so attacks can follow quickly.

  1. Check whether you run Esphome Esphome Firmware and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.
  4. Review logs and exposed services for signs of earlier compromise.

Timeline

  • Sep 2, 2025Published
  • Oct 19, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

Get notified about new Esphome Esphome Firmware CVEsYou are reading CVE-2025-57808. Get an email when KEV listings, exploits or new CVEs match your stack.
Set up CVE alerts

Related Coverage

External References

Data last checked: Nov 14, 2026 13:06 UTC