What is CVE-2023-42143?

CVE-2023-42143 is a medium-severity vulnerability in Shelly Trv, classified under Improper Validation of Integrity Check Value. CVSS score: 5.4/10. Published 2024-01-23.

How severe is CVE-2023-42143?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Shelly Trv

CVE-2023-42143

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.

Published 2024-01-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Shelly Trv
Shelly Trv Firmware — versions 2.1.8

Weakness classification (CWE)

CWE-354 — Improper Validation of Integrity Check Value

References

www.kth.se/cs/nse/research/software-systems-architecture-and-security/projects/… (Third Party Advisory)

Frequently asked questions

What is CVE-2023-42143?: CVE-2023-42143 is a medium-severity vulnerability in Shelly Trv, classified under Improper Validation of Integrity Check Value. CVSS score: 5.4/10. Published 2024-01-23.
How severe is CVE-2023-42143?: Medium severity. CVSS v3 base score is 5.4 out of 10.