Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The ESPHome package, versions before 2025.8.1, has an authentication bypass in its web_server component when running on the ESP-IDF platform. The check can pass when the Authorization value is empty or only a partial match of the correct credentials, so an attacker on the local network can reach web_server functions, including OTA updates if enabled, without knowing the username or password. Upgrade to ESPHome 2025.8.1 or later; for older versions, disabling the web_server component on ESP-IDF devices is suggested.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.015, the 75th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:34 UTC First seen by agentprime
- 31 Oct 2026, 14:34 UTC Confirmed by OSV