synced 4 MIN AGO
01 Record

CVE-2021-35533

Specially Crafted IEC 60870-5-104 Packet Vulnerability in RTU500 series

HighPUBLISHEDCNA: Hitachi Energy
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

02 Description

Specially Crafted IEC 60870-5-104 Packet Vulnerability in RTU500 series

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.95% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 60.8% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-11-26 16:37Z4 YR AGO
Last updated
2024-09-16 21:02Z2 YR AGO
Reserved
2021-06-28
Assigning CNA
Hitachi Energy
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
60b2a2760cfa4d8baf986b661ea4c05d1e3d95b866d42e1f2aa75ded6f621c45

05 Affected products

VendorProductVersionsPlatforms
Hitachi EnergyRTU500 seriesCMU Firmware version 12.0 to 12.0.*, CMU Firmware version 12.2 to 12.2.*, CMU Firmware version 12.4 to 12.4.*—

06 References

07 Remediation

- Disable BCI IEC 60870-5-104 function by configuration if it is not used. - Update to RTU500 series CMU Firmware version 12.6.5.0 or later (e.g., RTU500 CMU Firmware version 12.7.* or CMU Firmware version 13.2.* or later).