CVE-2017-12340

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Summary

CVECVE-2017-12340
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-11-30 09:29:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionA vulnerability in Cisco NX-OS System Software running on Cisco MDS Multilayer Director Switches, Cisco Nexus 7000 Series Switches, and Cisco Nexus 7700 Series Switches could allow an authenticated, local attacker to access the Bash shell of an affected device's operating system, even if the Bash shell is disabled on the system. The vulnerability is due to insufficient sanitization of user-supplied parameters that are passed to certain functions of the Python scripting sandbox of the affected system. An attacker could exploit this vulnerability to escape the scripting sandbox and enter the Bash shell of the operating system with the privileges of the authenticated user for the affected system. To exploit this vulnerability, the attacker must have local access to the affected system and be authenticated to the affected system with administrative or Python execution privileges. Cisco Bug IDs: CSCvd86513.

Risk And Classification

Primary CVSS: v3.0 4.2 MEDIUM from [email protected]

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

EPSS: 0.001310000 probability, percentile 0.321630000 (date 2026-05-14)

Problem Types: CWE-284 | CWE-116 | CWE-284 CWE-284

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary4.2MEDIUMCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
2.0[email protected]Primary4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Cisco Nx-os 8.1\(0.70\)s0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Cisco Multilayer Director Nexus 7000 Series And Nexus 7700 Series Switches affected Cisco Multilayer Director, Nexus 7000 Series, and Nexus 7700 Series Switches Not specified

References

ReferenceSourceLinkTags
Cisco NX-OS System Software CVE-2017-12340 Local Unauthorized Access Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Cisco Multilayer Director, Nexus 7000 Series, and Nexus 7700 Series Switches Bash Shell Unauthorized Access Vulnerability af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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