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CVE Record

CVE-2017-14471: An exploitable access control vulnerability exists in the data, program, and function file permissions func...

An exploitable access control vulnerability exists in the data, program, and function file permissions functionality of Allen Bradley Micrologix 1400 Series B FRN 21.2 and before. A specially crafted packet can cause a read or write operation resulting in disclosure of sensitive information, modification of settings, or modification of ladder logic. An attacker can send unauthenticated packets to trigger this vulnerability. Required Keyswitch State: REMOTE or PROG Associated Fault Codes: 0023, 002e, and 0037 Fault Type: Recoverable Description: The STI, EII, and HSC function files contain bits signifying whether or not a fault has occurred. Additionally there is a bit signaling the module to auto start. When these bits are set for any of the three modules and the device is moved into a run state, a fault is triggered.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This vulnerability affects Allen Bradley MicroLogix 1400 Series B controllers at FRN 21.2 and earlier. An unauthenticated network actor could cause unauthorized reads or writes, potentially exposing sensitive controller data, changing settings, modifying ladder logic, or triggering recoverable faults.

Executive priority

Treat this as high-priority for environments using affected controllers in production OT. The business concern is unauthorized process logic or settings modification, not only data exposure. Prioritize asset identification and isolation before routine patch planning.

Technical view

The issue is an access control weakness in data, program, and function file permissions. The CVSS v3.0 score is 10.0. Sources state exploitation requires network access and no credentials, with the controller keyswitch in REMOTE or PROG. STI, EII, and HSC function-file bits can contribute to recoverable faults when entering run state.

Likely exposure

Exposure is most likely where affected MicroLogix 1400 Series B controllers are network-reachable and operate with keyswitch state REMOTE or PROG. Confirm FRN versions, especially 21.2, 21.0, and 15, in OT asset inventories.

Exploitation context

The provided bundle does not show CISA KEV listing or active exploitation evidence. Public sources do describe unauthenticated network-triggerable access to read or write controller-related data, so internet or enterprise-reachable OT networks would materially increase risk.

Researcher notes

Evidence is strongest for affected versions, unauthenticated network reachability, required keyswitch states, and impact categories. The bundle does not include exploit-in-the-wild confirmation or a specific vendor fix, so remediation should be tied to official vendor guidance.

Mitigation direction

  • Check Rockwell or Allen Bradley guidance for supported firmware updates or compensating controls.
  • Identify affected MicroLogix 1400 Series B controllers and record FRN versions.
  • Restrict network paths to controller management and programming interfaces.
  • Keep controllers out of REMOTE or PROG except during authorized maintenance.
  • Review controller settings and ladder logic for unauthorized changes.

Validation and detection

  • Verify whether any MicroLogix 1400 Series B assets run FRN 21.2 or earlier.
  • Confirm keyswitch operating state for affected controllers.
  • Review network segmentation and access paths to affected controllers.
  • Check change records against current controller settings and ladder logic.
  • Monitor for unexpected recoverable fault codes 0023, 002e, or 0037.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2017-14471 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
10CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

10Critical
CVSS 3.0 vector shape for CVE-2017-14471Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TalosAllen BradleyAllen Bradley Micrologix 1400 Series B FRN 21.2, Allen Bradley Micrologix 1400 Series B FRN 21.0, Allen Bradley Micrologix 1400 Series B FRN 15Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.