CVE-2023-27482

Home/CVE/homeassistant is an open source home automation tool. A remotely exploitable vulnerability bypassing authentication for

CVE

homeassistant is an open source home automation tool. A remotely exploitable vulnerability bypassing authentication for

homeassistant is an open source home automation tool. A remotely exploitable vulnerability bypassing authentication for accessing the Supervisor API through Home Assistant has been discovered. This impacts all Home Assistant installation types that use the Supervisor 2023.01.1 or older.

Installation types, like Home Assistant Container (for example Docker), or Home Assistant Core manually in a Python environment, are not affected. The issue has been mitigated and closed in Supervisor version 2023.03.1, which has been rolled out to all affected installations via the auto-update feature of the Supervisor. This rollout has been completed at the time of publication of this advisory.

Home Assistant Core 2023.3.0 included mitigation for this vulnerability. Upgrading to at least that version is thus advised. In case one is not able to upgrade the Home Assistant Supervisor or the Home Assistant Core application at this time, it is advised to not expose your Home Assistant instance to the internet.

CRITICAL · CVSS 10 EPSS 0.9061

Act now

EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
EPSS percentile: top 0% of all CVEs by exploitation likelihood
Public exploit or PoC is available
SSVC automatable: yes - attacks can be scripted at scale
CVSS base score ≥ 7.0

Sigma rules0 YARA rules0

Look this up elsewhere - one-click external pivots

NVD CVE.org CISA Vulners Exploit-DB GitHub PoC VulnCheck KEV GreyNoise

▸ How to read a CVE - triage first, then detect and patch

This page is every public fact about CVE-2023-27482, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.

Triage: should I act now? Four signals, and they are not interchangeable:

CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.

How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.

Then what - two workflows:

Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.

Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).

View attack path from CVE-2023-27482

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ATT&CK techniques

Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.

T1040 · Network Sniffing T1134 · Access Token Manipulation T1185 · Browser Session Hijacking T1505.003 · Web Shell T1548 · Abuse Elevation Control Mechanism T1550.001 · Application Access Token T1557 · Adversary-in-the-Middle T1563 · Remote Service Session Hijacking

▤ Build a SIEM detection for these techniques

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CAPEC attack patterns

Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.

CAPEC-CAPEC-114 · Authentication Abuse CAPEC-CAPEC-115 · Authentication Bypass CAPEC-CAPEC-151 · Identity Spoofing CAPEC-CAPEC-194 · Fake the Source of Data CAPEC-CAPEC-22 · Exploiting Trust in Client CAPEC-CAPEC-57 · Utilizing REST's Trust in the System Resource to Obtain Sensitive Data CAPEC-CAPEC-593 · Session Hijacking CAPEC-CAPEC-633 · Token Impersonation CAPEC-CAPEC-650 · Upload a Web Shell to a Web Server CAPEC-CAPEC-94 · Adversary in the Middle (AiTM)

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Weakness Classification

CWE-287Improper Authentication

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Affected Products & Versions

home-assistant< 2023.3.0

home-assistant supervisor< 2023.03.1

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Public Exploits & PoCs

These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted.

nucleiHome Assistant Supervisor - Authentication Bypasscritical

pocelttam/publications (trickest)

pocARPSyndicate/cvemon (trickest)

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