CVE-2023-5768Network attack vector

Communication-link denial of service via malformed APDUs

Published Dec 4, 2023 · Updated Aug 2, 2024

Denial of service in affected Hitachi Energy RTU500 Series firmware allows remote attackers to block an HCI IEC 60870-5-104 link. The link-layer frame reader blocks indefinitely when an APDU supplies incorrect length information or data octets arrive late. No authentication or user interaction is required, but attack complexity is high; the affected link resumes normally after the malicious sequence stops.

CVSS severity5.9
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in affected Hitachi Energy RTU500 Series firmware allows remote attackers to block an HCI IEC 60870-5-104 link. The link-layer frame reader blocks indefinitely when an APDU supplies incorrect length information or data octets arrive late. No authentication or user interaction is required, but attack complexity is high; the affected link resumes normally after the malicious sequence stops.

The record

CVE
CVE-2023-5768
Published
Dec 4, 2023
Updated
Aug 2, 2024
Vendor
Hitachi Energy
Product
RTU500 Series
Classifications
CWE-1285, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=RTU500 series CMU Firmware version 12.0.1 – 12.0.14
  2. Affected versionversion=RTU500 series CMU Firmware version 12.2.1 – 12.2.11
  3. Affected versionversion=RTU500 series CMU Firmware version 12.4.1 – 12.4.11
  4. Affected versionversion=RTU500 series CMU Firmware version 12.6.1 – 12.6.9
  5. Affected versionversion=RTU500 series CMU Firmware version 12.7.1 – 12.7.6
  6. Affected versionversion=RTU500 series CMU Firmware version 13.2.1 – 13.2.6
  7. Affected versionversion=RTU500 series CMU Firmware version 13.4.1 – 13.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hitachi Energy · RTU500 Seriesversion=RTU500 series CMU Firmware version 12.0.1 – 12.0.14; version=RTU500 series CMU Firmware version 12.2.1 – 12.2.11; version=RTU500 series CMU Firmware version 12.4.1 – 12.4.11; version=RTU500 series CMU Firmware version 12.6.1 – 12.6.9; version=RTU500 series CMU Firmware version 12.7.1 – 12.7.6; version=RTU500 series CMU Firmware version 13.2.1 – 13.2.6; version=RTU500 series CMU Firmware version 13.4.1 – 13.4.3

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.9Hitachi EnergyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2CISACVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo