What is CVE-2023-6711?

CVE-2023-6711 is a medium-severity vulnerability in Hitachi Energy Rtu500 Series Cmu Firmware, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2023-12-19.

How severe is CVE-2023-6711?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Buffer overflow in Hitachi Energy Rtu500 Series Cmu Firmware

CVE-2023-6711

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.

Vulnerability class: Buffer Overflow

Published 2023-12-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Hitachi Energy Rtu500 Series Cmu Firmware — versions 12.0.1, 12.2.1, 12.4.1
Hitachienergy Rtu500
Hitachienergy Rtu500 Firmware — versions 13.5.1.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

publisher.hitachienergy.com/preview (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-6711?: CVE-2023-6711 is a medium-severity vulnerability in Hitachi Energy Rtu500 Series Cmu Firmware, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2023-12-19.
How severe is CVE-2023-6711?: Medium severity. CVSS v3 base score is 5.9 out of 10.