CVE-2021-3152Network attack vector

Unauthenticated file disclosure via custom integration traversal

Published Jan 21, 2021 · Updated Aug 3, 2024

Path traversal in custom integrations used with Home Assistant before 2021.1.3 allows remote attackers to read process-accessible files. Affected third-party integrations expose unauthenticated webviews that accept traversal paths without restricting file resolution to an intended directory. Exploitation requires an impacted custom integration; the vendor states that the flaws reside in those integrations, while Core lacked a protective interception layer.

CVSS severity5.3
Medium
EPSS probability2.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in custom integrations used with Home Assistant before 2021.1.3 allows remote attackers to read process-accessible files. Affected third-party integrations expose unauthenticated webviews that accept traversal paths without restricting file resolution to an intended directory. Exploitation requires an impacted custom integration; the vendor states that the flaws reside in those integrations, while Core lacked a protective interception layer.

The record

CVE
CVE-2021-3152
Published
Jan 21, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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