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).