CVE-2022-2081Network attack vector

Unauthenticated reboot via HCI Modbus TCP flooding

Published Jan 4, 2024 · Updated May 22, 2025

Denial of service in Hitachi Energy RTU500 Series CMU Firmware allows remote attackers to reboot a CMU through HCI Modbus TCP. The function lacks flood control, so a high rate of specially crafted messages causes an internal stack overflow and forces the device to restart. Exploitation requires HCI Modbus TCP to be enabled and configured, and the documented consequence is service interruption through reboot rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Hitachi Energy RTU500 Series CMU Firmware allows remote attackers to reboot a CMU through HCI Modbus TCP. The function lacks flood control, so a high rate of specially crafted messages causes an internal stack overflow and forces the device to restart. Exploitation requires HCI Modbus TCP to be enabled and configured, and the documented consequence is service interruption through reboot rather than data disclosure or modification.

The record

CVE
CVE-2022-2081
Published
Jan 4, 2024
Updated
May 22, 2025
Vendor
Hitachi Energy
Product
RTU500 Series CMU Firmware
Classifications
CWE-787, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 22, 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=12.0.1.0 <=12.0.13.0
  2. Affected versionversion=12.2.1.0 <=12.2.11.0
  3. Affected versionversion=12.4.1.0 <=12.4.11.0
  4. Affected versionversion=12.6.1.0 <=12.6.7.0
  5. Affected versionversion=12.7.1.0 <=12.7.3.0
  6. Affected versionversion=13.2.1.0 <=13.2.4.0
  7. Affected versionversion=13.3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hitachi Energy · RTU500 Series CMU Firmwareversion=12.0.1.0 <=12.0.13.0; version=12.2.1.0 <=12.2.11.0; version=12.4.1.0 <=12.4.11.0; version=12.6.1.0 <=12.6.7.0; version=12.7.1.0 <=12.7.3.0; version=13.2.1.0 <=13.2.4.0; version=13.3.1.0

Published CVSS scores

7.5Hitachi EnergyCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-787Out-of-bounds Write
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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