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Trv FirmwareOperating system · Shelly

CVE-2023-42143

MEDIUM · 5.4 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 →
58/100
Remediation priority · Elevated
Remotely reachable

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
Missing Integrity Check in Shelly TRV 20220811-152343/v2.1.8@5afc928c allows malicious users to create a backdoor by redirecting the device to an attacker-controlled machine which serves the manipulated firmware file. The device is updated with the manipulated firmware.

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 · moderate confidence

The Shelly TRV device's firmware update mechanism lacks cryptographic integrity verification (such as digital signature validation), allowing an attacker who can intercept or redirect the update request to supply malicious firmware that the device will install without verification, creating a persistent backdoor.

MitigationContact Shelly for patched firmware and implement network segmentation to prevent MITM attacks on device update traffic; monitor for unauthorized firmware version changes.

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
Network
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 devices on your network
    Scan your network for devices with Shelly TRV hostname or MAC OUI, or check your DHCP server/device inventory for Shelly TRV entries
    Affected if Shelly TRV devices are present on your network
  2. Check the installed firmware version
    Access the device's web interface (typically http://<device-ip>/) or query its REST API endpoint (e.g., http://<device-ip>/rpc/Sys.GetStatus) and locate the 'fw_id', 'firmware_version', or 'version' field in the response
    Affected if The displayed firmware version is exactly 2.1.8
  3. Verify the firmware update feature is accessible
    Check if the device's web UI exposes a Settings or Firmware Update page, or query the /rpc/Sys.GetConfig endpoint to see if update-related settings are present and not disabled
    Affected if The device has an accessible firmware update mechanism enabled

You are affected if you have a Shelly TRV device running firmware version 2.1.8 with the firmware update feature accessible.

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

Contact Shelly for patched firmware and implement network segmentation to prevent MITM attacks on device update traffic; monitor for unauthorized firmware version changes.

Fix this in Trv Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2023-42143 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
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