CVE-2023-42143: Missing Integrity Check in Shelly TRV 20220811-152343/v2.1.8@5afc928c allows malicious users to create a backd

Routine

MEDIUM 5.4MITIGATE

CVE-2023-42143 is a medium-severity flaw (CVSS 5.4) affecting trv firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-354
Published	2024-01-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: shelly

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-23 20:15 UTCPublished CVE record published
2026-06-17 06:23 UTCUpdated Record last modified

shelly trv firmware MITIGATE

Affected: 2.1.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.8

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-42143?

trv firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-42143 being exploited?

CVE-2023-42143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-42143 affect?

CVE-2023-42143 affects trv firmware. Severity is medium (CVSS 5.4). 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

How urgent is CVE-2023-42143?

Priority 20/100. No elevated risk signals yet.

Related CVEs

CVE-2023-42144 MEDIUM 5.5 MITIGATE Cleartext Transmission during initial setup in Shelly TRV 20220811-15234 v.2.1.8 allows a local attacker to ob

References

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