CVE-2021-22642 | Ovarro TBox Uncontrolled Resource Consumption

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

Published: 2022-07-28 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-22642 is rated Moderate Risk (47.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.71%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-22642

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.26% 0.71% +0.44%
2 2026-01-21 0.25% 0.26% +0.01%
3 2025-07-30 — 0.25% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22642

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2021-22642

Affected software / configurations for CVE-2021-22642

Vendor Product Version Raw CPE
ovarro twinsoft < 12.4 cpe:2.3:a:ovarro:twinsoft:*:*:*:*:*:*:*:*
ovarro tbox_lt2-530_firmware < 1.46 cpe:2.3:o:ovarro:tbox_lt2-530_firmware:*:*:*:*:*:*:*:*
ovarro tbox_lt2-532_firmware < 1.46 cpe:2.3:o:ovarro:tbox_lt2-532_firmware:*:*:*:*:*:*:*:*
ovarro tbox_lt2-540_firmware < 1.46 cpe:2.3:o:ovarro:tbox_lt2-540_firmware:*:*:*:*:*:*:*:*
ovarro tbox_ms-cpu32_firmware < 1.46 cpe:2.3:o:ovarro:tbox_ms-cpu32_firmware:*:*:*:*:*:*:*:*
ovarro tbox_ms-cpu32-s2_firmware < 1.46 cpe:2.3:o:ovarro:tbox_ms-cpu32-s2_firmware:*:*:*:*:*:*:*:*
ovarro tbox_rm2_firmware < 1.46 cpe:2.3:o:ovarro:tbox_rm2_firmware:*:*:*:*:*:*:*:*
ovarro tbox_tg2_firmware < 1.46 cpe:2.3:o:ovarro:tbox_tg2_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-22642

URL Tags
https://www.cisa.gov/uscert/ics/advisories/icsa-21-054-04 Third Party Advisory US Government Resource
cvelogic Threat Intelligence