Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated network attacker disrupt legitimate connections to affected Allen-Bradley MicroLogix 1400 Series B PLCs. The direct impact described is availability loss, not data theft or code execution. Business urgency depends on whether exposed controllers support operational processes where lost PLC connectivity could interrupt monitoring or control.
Executive priority
Treat as a moderate operational resilience issue. Prioritize review in environments where affected PLCs support production, safety-adjacent monitoring, or remote operations. The absence of sourced active exploitation lowers urgency, but unauthenticated network reachability raises business risk.
Technical view
CVE-2017-12093 is an insufficient resource pool issue in session communication. A crafted packet stream can flood the session resource pool, disconnecting legitimate PLC sessions. The CVSS v3.0 score is 5.3 with network access, low complexity, no privileges, no user interaction, and low availability impact.
Likely exposure
Exposure is most likely where Allen-Bradley MicroLogix 1400 Series B controllers running FRN 21.2, 21.0, or 15 are reachable over networks accessible to untrusted users or systems. The provided evidence does not identify other affected products.
Exploitation context
The source bundle describes unauthenticated network-triggered denial of service through packet flooding. It does not include evidence of active exploitation, and the bundle marks KEV as false. No public exploit status should be inferred from the provided sources.
Researcher notes
The evidence supports availability-only impact against specific MicroLogix 1400 Series B firmware. The bundle does not provide CWE mapping, confirmed patches, or detailed vendor remediation. Avoid expanding scope beyond the named firmware unless additional vendor evidence is obtained.
Mitigation direction
- Identify affected MicroLogix 1400 Series B firmware versions in operational environments.
- Check Rockwell/Allen-Bradley and Talos guidance for fixed firmware or approved mitigations.
- Restrict PLC network access to trusted management and control systems only.
- Segment industrial control networks from corporate and internet-reachable networks.
- Monitor for unexpected PLC session drops or repeated connection failures.
Validation and detection
- Inventory MicroLogix 1400 Series B controllers and record firmware revision numbers.
- Confirm whether any controllers run FRN 21.2, 21.0, 15, or earlier affected firmware.
- Review network paths to determine if untrusted systems can reach PLC session services.
- Check operational logs for unexplained disconnections affecting legitimate PLC clients.
- Document compensating controls where firmware status cannot be immediately changed.
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
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CVE-2017-12093 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
- Medium
- CVSS
- 5.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.3MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0445CVE 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.