Security readout for executives and security teams
Plain-English summary
This flaw affects several Hitachi Energy protection and control products used in operational environments. A user with credentials could bypass internal controls and modify sensitive data or firmware, potentially disabling affected equipment. The issue is high severity but the provided sources do not show active exploitation.
Executive priority
Treat as high priority for operational technology environments because exploitation could disable protection/control equipment. Prioritize asset identification, vendor guidance review, and controlled firmware remediation, especially where many users have credentials.
Technical view
CVE-2021-35534 is a CWE-274 insufficient security control issue in internal database access. The product does not sufficiently restrict access to internal database tables. CVSS 3.1 is 7.2 with network access, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely limited to environments running listed Hitachi Energy Relion 670/650, Relion 670/650/SAM600-IO, Relion 650, GMS600, or PWC600 versions, where authenticated users can reach the affected management or internal database access path.
Exploitation context
The source bundle indicates exploitation requires valid user credentials and network reachability. It may allow security-control bypass, unauthorized data or firmware modification, and permanent product disabling. KEV status is false, and no provided source confirms exploitation in the wild.
Researcher notes
Evidence is strongest for impact, affected versions, and CVSS characteristics. The bundle does not include exploit details, proof of exploitation, or complete remediation text for every affected product family, so avoid assuming fixes beyond named version thresholds.
Mitigation direction
- Inventory affected Hitachi Energy product models and firmware versions.
- Upgrade beyond vendor-identified affected versions where fixed releases are named.
- Review the linked Hitachi Energy advisories for exact remediation guidance.
- Restrict authenticated access to trusted operators until remediation is complete.
- Monitor for unauthorized firmware, configuration, or data changes.
Validation and detection
- Compare deployed firmware versions against the affected version list.
- Confirm whether Relion 670 2.2.3 is at least 2.2.3.5.
- Confirm whether Relion 670/650/SAM600-IO 2.2.5 is at least 2.2.5.2.
- Confirm whether Relion 650 1.3 is at least 1.3.0.8.
- Review operational logs for unexpected configuration, firmware, or database changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-274: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-35534 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000058&LanguageCode=en&DocumentPartId=&Action=LaunchCVE reference · x_refsource_CONFIRM
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000059&LanguageCode=en&DocumentPartId=&Action=LaunchCVE reference · x_refsource_CONFIRM
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000060&LanguageCode=en&DocumentPartId=&Action=LaunchCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Handling of Insufficient Privileges
Improper Handling of Insufficient Privileges represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.