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Trv FirmwareOperating system · Shelly

CVE-2023-42144

MEDIUM · 5.5 CVSS v3.1 Published 2024-01-23
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
57/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Cleartext Transmission during initial setup in Shelly TRV 20220811-15234 v.2.1.8 allows a local attacker to obtain the Wi-Fi password.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The Shelly TRV thermostat device (version 2.1.8, build 20220811-15234) transmits the Wi-Fi password in cleartext during the initial setup process. A local attacker on the same network can intercept this transmission and obtain the Wi-Fi credentials.

MitigationIsolate the device on a dedicated network segment during setup. Check for and apply any available firmware updates from the vendor that address this cleartext transmission issue.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Trv FirmwareOperating system
Affected:= 2.1.8

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Shelly TRV device
    Locate the physical Shelly TRV thermostat on your network or inspect your device inventory to confirm the device model is Shelly TRV
    Affected if The device is a Shelly TRV thermostat
  2. Access device firmware version
    Connect to the device web interface or use the Shelly mobile app to view the device information. The firmware version is typically displayed in the device settings or device info section
    Affected if The displayed firmware version is exactly 2.1.8 (build 20220811-15234)
  3. Confirm setup scenario
    Determine whether the device is currently in initial setup mode or was recently set up. During the first-time configuration, the device broadcasts Wi-Fi credentials in cleartext
    Affected if The device is undergoing or has recently completed initial setup on the same network where an attacker could be present

If the Shelly TRV thermostat is running firmware version 2.1.8 and is in or was recently put through initial setup, the cleartext Wi-Fi password transmission vulnerability is present.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Isolate the device on a dedicated network segment during setup. Check for and apply any available firmware updates from the vendor that address this cleartext transmission issue.

Fix this in Trv Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-42144 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data