Security readout for executives and security teams
Plain-English summary
This issue affects Rockwell Automation MicroLogix controllers and RSLogix 500 software. A remote attacker who can reach the controller could trigger a client-style request that causes the controller to return password values used for authentication. The main business risk is credential exposure and possible authentication bypass in industrial control environments.
Executive priority
Prioritize this for OT environments using listed Rockwell MicroLogix assets, especially if they are network-reachable beyond trusted engineering stations. Treat as high priority for confidentiality and access-control risk, not as proven active exploitation based on the provided evidence.
Technical view
CVE-2020-6988 is a client-side authentication weakness, classified as CWE-603. A remote, unauthenticated attacker may send a request resembling RSLogix 500 activity to a MicroLogix controller, causing disclosure of used password values. CVSS 3.1 is 7.5, network exploitable, low complexity, no privileges, no user interaction, with high confidentiality impact.
Likely exposure
Exposure is most relevant where affected MicroLogix 1100 or 1400 controllers are reachable over networks accessible to untrusted users, vendors, flat OT networks, or remote access paths. RSLogix 500 v12.001 and prior is also listed as affected. Internet exposure would increase urgency, but the provided sources do not state prevalence.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The attack is described as remote and unauthenticated, with low complexity and no user interaction. It primarily threatens confidentiality by exposing password values, which may support authentication bypass or credential leakage.
Researcher notes
The record names affected products and describes credential disclosure through client-side authentication design. The provided data does not include patch versions, exploit demonstrations, or active exploitation evidence. Avoid assuming broader Rockwell product impact beyond the listed MicroLogix and RSLogix 500 versions.
Mitigation direction
- Identify affected MicroLogix 1100, MicroLogix 1400, and RSLogix 500 versions.
- Review Rockwell Automation and CISA ICS advisory guidance for approved fixes or compensating controls.
- Restrict network access to controllers from untrusted networks and remote access paths.
- Segment OT networks and limit engineering workstation access to required hosts only.
- Rotate exposed or shared controller credentials where compromise is suspected.
Validation and detection
- Inventory controller model, series, and firmware/software versions against the affected list.
- Confirm whether controllers are reachable from corporate, vendor, wireless, or internet-connected networks.
- Review firewall and access-control rules protecting controller management traffic.
- Check logs and network telemetry for unusual engineering workstation-style requests.
- Verify 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-603: 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-2020-6988 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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:N/A:N3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.