CVE-2023-6711Network attack vector

CMU reboot via malformed IEC 104 messages

Published Dec 19, 2023 · Updated Sep 25, 2024

Buffer overflow in SCI and HCI IEC 60870-5-104 in Hitachi Energy RTU500 CMU Firmware allows remote attackers to reboot the CMU. The components process specially crafted protocol messages without adequate validation, causing a buffer overflow. No authentication or user interaction is required, but Hitachi Energy rates exploitation as high complexity and bounds the effect to a device reboot.

CVSS severity5.9
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in SCI and HCI IEC 60870-5-104 in Hitachi Energy RTU500 CMU Firmware allows remote attackers to reboot the CMU. The components process specially crafted protocol messages without adequate validation, causing a buffer overflow. No authentication or user interaction is required, but Hitachi Energy rates exploitation as high complexity and bounds the effect to a device reboot.

The record

CVE
CVE-2023-6711
Published
Dec 19, 2023
Updated
Sep 25, 2024
Vendor
Hitachi Energy
Product
RTU500 Series CMU Firmware
Classifications
CWE-120, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=12.0.1 <=12.0.14
  2. Affected versionversion=12.2.1 <=12.2.11
  3. Affected versionversion=12.4.1 <=12.4.11
  4. Affected versionversion=12.6.1 <=12.6.9
  5. Affected versionversion=12.7.1 <=12.7.6
  6. Affected versionversion=13.2.1 <=13.2.6
  7. Affected versionversion=13.4.1 <=13.4.3
  8. Affected versionversion=13.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hitachi Energy · RTU500 Series CMU Firmwareversion=12.0.1 <=12.0.14; version=12.2.1 <=12.2.11; version=12.4.1 <=12.4.11; version=12.6.1 <=12.6.9; version=12.7.1 <=12.7.6; version=13.2.1 <=13.2.6; version=13.4.1 <=13.4.3; version=13.5.1

Published CVSS scores

5.9Hitachi EnergyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T0814Denial of Service

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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