Security readout for executives and security teams
Plain-English summary
This affects Rockwell MicroLogix controllers and RSLogix 500 software where the password-protection cryptographic function is discoverable. In practical terms, password protections may not provide reliable security. The CVSS score is critical, but the provided sources do not show CISA KEV listing or confirmed active exploitation.
Executive priority
Treat as a high-priority OT security issue where affected Rockwell systems exist. The business concern is loss of trust in controller password protection, with potential safety, production, and availability implications. Prioritize asset discovery and vendor-guided remediation before emergency assumptions.
Technical view
CVE-2020-6984 is a CWE-327 weakness in Rockwell Automation MicroLogix 1400, MicroLogix 1100, and RSLogix 500 versions listed by the CVE. CVSS 3.1 is 9.8, network-accessible, low complexity, no privileges, and no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely in industrial environments using MicroLogix 1400 Series B v21.001 or earlier, MicroLogix 1400 Series A, MicroLogix 1100, or RSLogix 500 v12.001 or earlier. Risk is higher where controller or engineering access is reachable from broader networks.
Exploitation context
The CVSS vector indicates remote network exploitation is possible without authentication or user interaction. The provided sources do not confirm public exploit availability or active exploitation, and the CVE is not marked as CISA KEV in the supplied data.
Researcher notes
The key issue is discoverability of the cryptographic function used to protect MicroLogix passwords. Sources identify affected products and critical CVSS but provide limited detail in the supplied bundle about exploit maturity or specific fixes. Avoid extrapolating beyond the CISA/Rockwell advisory.
Mitigation direction
- Inventory affected MicroLogix controllers and RSLogix 500 installations.
- Review the CISA/Rockwell advisory for vendor-approved fixes or compensating controls.
- Prioritize remediation for systems reachable from corporate, remote-access, or vendor networks.
- Do not assume password protection alone is sufficient for affected systems.
Validation and detection
- Confirm exact MicroLogix model, series, and firmware version.
- Confirm RSLogix 500 version is above or within affected range.
- Compare assets directly against the CVE affected product list.
- Verify whether vendor-recommended remediation has been applied.
- Review network reachability to affected engineering and controller interfaces.
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-327: 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 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-2020-6984 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.
SSVC decision data
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:H3.95.9CISA-ADPVulnerability 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
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.us-cert.gov/ics/advisories/icsa-20-070-06CVE reference, icscert · 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.