CVE-2021-41104
7.5 HIGHESPHome is a system to control the ESP8266/ESP32
Published: 2021-09-28 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 7.5 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CWE
- CWE-306
Affected products
| Vendor | Product |
|---|---|
| esphome | esphome_firmware |
Description
ESPHome is a system to control the ESP8266/ESP32. Anyone with web_server enabled and HTTP basic auth configured on version 2021.9.1 or older is vulnerable to an issue in which `web_server` allows over-the-air (OTA) updates without checking user defined basic auth username & password. This issue is patched in version 2021.9.2. As a workaround, one may disable or remove `web_server`.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-41104
- [Patch]https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1e
- [Other]https://github.com/esphome/esphome/releases/tag/2021.9.2
- [Patch]https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm
- [Patch]https://github.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1e
- [Other]https://github.com/esphome/esphome/releases/tag/2021.9.2
- [Patch]https://github.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm
Related CVEs
Same CWE
- CVE-2026-0647 — An improper authentication security issue exists within the 1794-AENTR adapter's embedded web server
- CVE-2018-25437 — WordPress CherryFramework Themes 3.1.4 contains an information disclosure vulnerability that allows unauthenticated attackers to download... (7.5 HIGH)
- CVE-2026-12183 — Nefteprodukttekhnika BUK TS-G Gas Station Automation System 2.9.1 through 2.10.2 on Linux contains an Improper Authentication vulnerabili... (9.8 CRITICAL)
- CVE-2026-53868 — Capgo before 12.128.2 contains a denial of service vulnerability allowing attackers to register accounts using arbitrary email addresses ... (7.5 HIGH)
- CVE-2026-50287 — AgenticMail gives AI agents real email addresses and phone numbers