Security readout for executives and security teams
Plain-English summary
mySCADA myPRO 8.20.0 and earlier contains an undocumented administrative account that normal administrators cannot see, delete, or change through the web interface. If reachable, this could let an unauthenticated attacker gain powerful access and affect confidentiality, integrity, and availability of an industrial system.
Executive priority
Treat this as urgent for any exposed or business-critical mySCADA myPRO environment. The risk is not theoretical configuration weakness; it is an undocumented administrator path with full-impact CVSS scoring.
Technical view
The issue is CWE-912 hidden functionality: an additional undocumented administrative account in mySCADA myPRO versions 8.20.0 and prior. CVSS 3.1 is 9.8 with network attack vector, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most concerning where mySCADA myPRO is deployed on reachable OT, SCADA, or management networks, especially if accessible from untrusted networks. The source bundle does not prove internet exposure counts or deployment prevalence.
Exploitation context
The CVE is not listed as CISA KEV in the supplied bundle, and no cited source states active exploitation. The scoring indicates exploitation would not require credentials or user interaction if the vulnerable service is reachable.
Researcher notes
Evidence is limited to the CVE description and CISA ICS advisory reference in the bundle. Do not assume a patch version, exploit availability, or affected deployment scope without reviewing vendor/CISA details and the local asset inventory.
Mitigation direction
- Inventory mySCADA myPRO deployments and identify versions 8.20.0 and prior.
- Check mySCADA and CISA advisory guidance for supported remediation or update paths.
- Restrict myPRO access to trusted administrative networks only.
- Remove any direct internet exposure where operationally possible.
- Increase monitoring for unexpected administrative access or configuration changes.
Validation and detection
- Confirm deployed mySCADA myPRO version numbers against 8.20.0 and prior.
- Review account management interfaces for inability to manage the undocumented account.
- Check network paths to determine whether myPRO is reachable from untrusted networks.
- Review authentication and administrative logs for unexplained privileged activity.
- Track remediation status against vendor or CISA advisory instructions.
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-912: 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 lookupCVE-2021-43987 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-355-01CVE reference · x_refsource_MISC
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.
Hidden Functionality
Hidden Functionality represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.