CVE-2021-3152

Name: CVE-2021-3152
Creator: NVD / NIST
Published: 2021-01-26T18:16:27.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.23%

Last modified Jun 17, 2026

CVE-2021-3152 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 2.23% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

2.23%

80.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Home-Assistant	Home-Assistant	< 2021.1.3

References

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

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3152?

How severe is CVE-2021-3152?

CVE-2021-3152 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3152?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3152?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST