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CVE-2021-41104

7.5 · HIGH

ESPHome is a system to control the ESP8266/ESP32.

Published Sep 28, 2021CWE-306EPSS 1.21%

Overview

CVE-2021-41104 is a high-severity vulnerability. It was published on September 28, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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`.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1eGitHubgithub.com/esphome/esphome/releases/tag/2021.9.2GitHubgithub.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfmGitHubgithub.com/esphome/esphome/pull/2409/commits/207cde1667d8c799a197b78ca8a5a14de8d5ca1eGitHubgithub.com/esphome/esphome/releases/tag/2021.9.2GitHubgithub.com/esphome/esphome/security/advisories/GHSA-48mj-p7x2-5jfm

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41104?

CVE-2021-41104 is a high-severity vulnerability. It was published on September 28, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-41104?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-41104?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41104?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41104 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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