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Fencer Vulns
medium 5.9

CVE-2023-6711 json

Vulnerability exists in SCI IEC 60870-5-104 and HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below.

published 2023-12-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58931

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Vulnerability exists in SCI IEC 60870-5-104 and HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Specially crafted messages sent to the mentioned components are not validated properly and can result in buffer overflow and as final consequence to a reboot of an RTU500 CMU.

Patch / fix

  • hitachienergy rtu500_firmware 12.0.15.0, 12.2.12.0, 12.4.12.0, 12.6.10.0, 12.7.7.0, 13.2.7.0, 13.4.4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-354-01 updated cvss 5.9

Hitachi Energy RTU500 series CMU

  • Hitachi Energy RTU500 series CMU Firmware >=12.0.1, <=12.0.14, >=12.2.1, <=12.2.11, >=12.4.1, <=12.4.11, >=12.6.1, <=12.6.9
    affected: vendor fix, mitigation “Hitachi Energy recommends that users update to the respective series CMU firmware version as below.” publisher.hitachienergy.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Hitachi Energy RTU500 series CMU Firmware

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.