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CVE Record

CVE-2017-14462: 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 (also RUN for some) Description: Allows an attacker to enable SNMP, Modbus, DNP, and any other features in the channel configuration. Also allows attackers to change network parameters, such as IP address, name server, and domain name.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This flaw lets an unauthenticated network attacker read or change sensitive PLC configuration on affected Allen-Bradley MicroLogix 1400 controllers. Business risk is high because settings, network parameters, and ladder logic may be changed, potentially affecting industrial operations.

Executive priority

Prioritize environments where affected PLCs control production, safety-adjacent, or remote operations. The issue is critical due to unauthenticated writes, but remediation planning should follow vendor guidance and OT change-control constraints.

Technical view

CVE-2017-14462 is an access-control weakness in data, program, and function file permissions for MicroLogix 1400 Series B FRN 21.2 and earlier. Crafted packets can trigger unauthenticated read or write operations with high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely where affected MicroLogix 1400 Series B controllers are reachable over IP networks and operating in REMOTE or PROG keyswitch states. The source notes some impact may also apply in RUN state.

Exploitation context

The provided sources describe unauthenticated network-triggered access but do not state active exploitation. The CVE is not listed as KEV in the supplied bundle. Treat internet or enterprise-reachable PLCs as urgent exposure until verified.

Researcher notes

The bundle attributes affected versions to Allen-Bradley MicroLogix 1400 Series B FRN 21.2, 21.0, and 15. Evidence supports unauthenticated read/write impact but does not include exploit availability, patch details, or confirmed real-world exploitation.

Mitigation direction

  • Identify affected MicroLogix 1400 Series B firmware versions in OT inventories.
  • Check Rockwell or Allen-Bradley guidance for supported firmware updates or compensating controls.
  • Restrict network access to PLC management and programming interfaces.
  • Isolate affected controllers from internet and general corporate networks.
  • Avoid REMOTE or PROG keyswitch states unless operationally required.
  • Review change-control records for unexpected configuration or ladder logic changes.

Validation and detection

  • Confirm controller model, Series B status, and FRN version.
  • Map network paths that can reach affected controllers.
  • Verify keyswitch state for each deployed controller.
  • Review whether SNMP, Modbus, DNP, or other services were unexpectedly enabled.
  • Compare ladder logic and network settings against known-good baselines.
  • Check vendor advisories before declaring remediation complete.
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-2017-14462 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-2017-14462Attack 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.