Security readout for executives and security teams
Plain-English summary
This issue concerns weak credential requirements in Hitachi Energy FOX61x and XCM20 systems before R15A. If exposed in the Data Communication Network, an attacker could gain unauthorized access to routing configuration, creating serious integrity and availability risk for communications operations.
Executive priority
Treat as a high-priority operational technology risk where affected devices are deployed. The business concern is unauthorized change to communications routing, which can disrupt availability and integrity of critical network operations.
Technical view
CVE-2021-40333 is CWE-521 affecting Hitachi Energy FOX61x and XCM20 versions prior to R15A. The CVSS 3.1 score is 9.0 with network attack vector, low attack complexity, no user interaction, changed scope, and high integrity and availability impact.
Likely exposure
Exposure is likely limited to organizations operating Hitachi Energy FOX61x or XCM20 devices before R15A, especially where TCP port 26 or DCN management paths are reachable beyond tightly controlled administrative networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Risk remains high because the issue affects routing configuration access and is network-reachable under the CVSS vector. The source bundle does not provide exploit details.
Researcher notes
The record identifies weak password requirements and a port 26 association, but the bundle does not include detailed exploit mechanics or complete remediation text. Keep analysis bounded to affected products, pre-R15A versions, and vendor advisory validation.
Mitigation direction
- Identify FOX61x and XCM20 assets and confirm installed release versions.
- Prioritize upgrade planning for versions prior to R15A using Hitachi Energy guidance.
- Restrict TCP port 26 and DCN management access to trusted administrative paths.
- Review and strengthen device credential policies where vendor guidance permits.
- Monitor for unauthorized DCN routing configuration changes.
Validation and detection
- Inventory affected Hitachi Energy FOX61x and XCM20 devices.
- Verify whether each device is running a version prior to R15A.
- Check whether TCP port 26 is reachable from untrusted networks.
- Review access logs and configuration history for unexpected routing changes.
- Confirm remediation steps against the cited Hitachi Energy advisories.
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-521: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-40333 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
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/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:C/C:L/I:H/A:H2.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000062&LanguageCode=en&DocumentPartId=&Action=LaunchCVE reference · x_refsource_CONFIRM
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000069&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.
Weak Password Requirements
Weak Password Requirements represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.