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CVE Record

CVE-2019-1836: Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Symbolic Link Path Traversal Vulnerability

A vulnerability in the system shell for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated, local attacker to use symbolic links to overwrite system files. These system files may be sensitive and should not be overwritable by non-root users. The attacker would need valid device credentials. The vulnerability is due to incorrect symbolic link verification of directory paths when they are used in the system shell. An attacker could exploit this vulnerability by authenticating to the device and providing crafted user input to specific symbolic link CLI commands. Successful exploitation could allow the attacker to overwrite system files that should be restricted. This vulnerability has been fixed in software version 14.1(1i).

MediumCVSS 5.5Not KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

This issue lets someone who already has device credentials locally overwrite protected system files on Cisco Nexus 9000 fabric switches running ACI mode. It is not described as remote or unauthenticated, but successful abuse could damage system integrity on critical network infrastructure. Exposure is limited to Cisco Nexus 9000 Series Fabric Switches in ACI mode running affected NX-OS software. The source bundle does not provide exact affected version ranges, only that software version 14.1(1i) contains the fix. Treat as a scheduled network-infrastructure remediation unless local credential misuse is suspected. Prioritize environments where many administrators, contractors, or automation accounts can access ACI fabric switches. Mitigation focus: Upgrade affected ACI-mode Nexus 9000 switches to Cisco software version 14.1(1i) as applicable.; Check Cisco advisory guidance for exact affected releases and recommended upgrade path.; Restrict device credentials and shell/CLI access to trusted administrators..

Prepared

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

Potential ATT&CK relevance

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ATT&CK lookup starting points

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cwe · medium confidence lookup

CWE-22: File access and web shell behavior lookup

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description · low confidence lookup

File access behavior lookup

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cve · low confidence lookup

CVE-2019-1836 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.0)
Known Exploited
No
Published

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

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
5.5CVSS 3.0MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.5Medium
CVSS 3.0 vector shape for CVE-2019-1836Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI ModeunspecifiedListed
Weakness

CWE details

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

CWE-22 · source CWE mapping

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.