CVE & CISA-KEV Catalog

CVE-2021-22640

HIGH
7.5
CVSS v3
NVD

Description

An attacker can decrypt the Ovarro TBox login password by communication capture and brute force attacks.

CWE-294CWE-307CWE-522

How to fix

Remediation Available
tbox lt2-530 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox lt2-532 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox lt2-540 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox ms-cpu32-s2 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox ms-cpu32 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox rm2 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
tbox tg2 firmwareNVD
Affected:< 1.46Fixed in:1.46CVE-2021-22640derived from NVD
twinsoftNVD
Affected:< 12.4Fixed in:12.4CVE-2021-22640derived from NVD

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.76%probability of exploitation in 30 days
52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Third-Party Advisory1

Related Vulnerabilities

Other CWE-294 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-23397Critical9.897%KEVFix
CVE-2017-3191Critical9.863%--
CVE-2023-49231Critical9.843%--
CVE-2002-0054High7.522%--
CVE-2022-29593Medium5.913%--
CVE-2022-22806Critical9.812%--

Common questions

How do I fix CVE-2021-22640?

Published advisories record a fix for 8 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-22640 being actively exploited?

Not that we know of. CVE-2021-22640 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.76% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

How severe is CVE-2021-22640?

CVE-2021-22640 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-22640 affect?

Published advisories record a fix for tbox lt2-530 firmware (NVD), tbox lt2-532 firmware (NVD), tbox lt2-540 firmware (NVD), tbox ms-cpu32-s2 firmware (NVD), and 4 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-17.