CVE-2021-3152

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-01-26 · updated 2026-06-17
Weakness: CWE-22

Description

Home Assistant before 2021.1.3 does not have a protection layer that can help to prevent directory-traversal attacks against custom integrations. NOTE: the vendor's perspective is that the vulnerability itself is in custom integrations written by third parties, not in Home Assistant; however, Home Assistant does have a security update that is worthwhile in addressing this situation

Affected products

Home-Assistant: before 2021.1.3 — fixed in 2021.1.3

How to fix

Upgrade to a fixed version: Home-Assistant 2021.1.3. Check the vendor advisory for mitigations.

References

https://www.home-assistant.io/blog/2021/01/14/security-bulletin/
https://www.home-assistant.io/blog/2021/01/22/security-disclosure/
https://www.home-assistant.io/blog/2021/01/14/security-bulletin/
https://www.home-assistant.io/blog/2021/01/22/security-disclosure/

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