CVE-2021-22640Network attack vector

Login-password recovery via captured Modbus traffic

Published Jul 28, 2022 · Updated Apr 17, 2025

Insufficient credential protection in Ovarro TBox firmware 1.45 and earlier allows remote attackers to recover login passwords. The proprietary Modbus channel carries protected login credentials that captured communications expose to brute-force recovery. Network access sufficient to capture RTU-to-engineering-software communications is required, and the bounded impact is disclosure of the login password.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient credential protection in Ovarro TBox firmware 1.45 and earlier allows remote attackers to recover login passwords. The proprietary Modbus channel carries protected login credentials that captured communications expose to brute-force recovery. Network access sufficient to capture RTU-to-engineering-software communications is required, and the bounded impact is disclosure of the login password.

The record

CVE
CVE-2021-22640
Published
Jul 28, 2022
Updated
Apr 17, 2025
Vendor
Ovarro
Product
TBox
Classifications
CWE-294, CWE-307, CWE-522, T1110.001, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=LT2
  2. Affected versionversion=MS-CPU32
  3. Affected versionversion=MS-CPU32-S2
  4. Affected versionversion=RM2
  5. Affected versionversion=TG2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ovarro · TBoxversion=LT2; version=MS-CPU32; version=MS-CPU32-S2; version=RM2; version=TG2

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CWE-307Improper Restriction of Excessive Authentication Attempts
CWE-522Insufficiently Protected Credentials
T1110.001Password Guessing
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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