CVE-2021-41104 affects ESPHome versions 2021.9.1 and older, specifically when the web_server is enabled with HTTP basic authentication. The vulnerability allows unauthenticated over-the-air (OTA) updates, bypassing the configured basic authentication for ESP8266/ESP32 devices. Rated 7.5 HIGH on the CVSS scale, this vulnerability is easily exploitable over the network without user interaction (AV:N/AC:L/PR:N/UI:N), leading to high integrity impact (I:H) as unauthorized firmware can be installed. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2021.9.2CPE matchmatch criteria | cpe:2.3:o:esphome:esphome_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.