What is CVE-2021-22642?

CVE-2021-22642 is a high-severity vulnerability in Ovarro Tbox, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-07-28.

How severe is CVE-2021-22642?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Ovarro Tbox

CVE-2021-22642

An attacker could use specially crafted invalid Modbus frames to crash the Ovarro TBox system.

Vulnerability class: DoS (Denial of Service)

Published 2022-07-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000

Affected products

Ovarro Tbox — versions LT2, MS-CPU32, MS-CPU32-S2
Ovarro Tbox Lt2-530
Ovarro Tbox Lt2-530 Firmware
Ovarro Tbox Lt2-532
Ovarro Tbox Lt2-532 Firmware
Ovarro Tbox Lt2-540
Ovarro Tbox Lt2-540 Firmware
Ovarro Tbox Ms-Cpu32
Ovarro Tbox Ms-Cpu32 Firmware
Ovarro Tbox Ms-Cpu32-S2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.cisa.gov/uscert/ics/advisories/icsa-21-054-04 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-22642?: CVE-2021-22642 is a high-severity vulnerability in Ovarro Tbox, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-07-28.
How severe is CVE-2021-22642?: High severity. CVSS v3 base score is 7.5 out of 10.