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Nx OsOperating system · Cisco

CVE-2017-12329

MEDIUM · 6.3 CVSS v3.0 Published 2017-11-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
65/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability in the CLI of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software could allow an authenticated, local attacker to perform a command injection attack. The vulnerability is due to insufficient input validation of command arguments to the CLI parser. An attacker could exploit this vulnerability by injecting crafted command arguments into a vulnerable CLI command. An exploit could allow the attacker to execute arbitrary commands at the user's privilege level. On products that support multiple virtual device contexts (VDCs), this vulnerability could allow the attacker to execute commands at the user's privilege level outside the user's environment. This vulnerability affects the following products running Cisco FXOS or NX-OS System Software: Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, Multilayer Director Switches, Nexus 1000V Series Switches, Nexus 2000 Series Fabric Extenders, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System Manager. Cisco Bug IDs: CSCve51700, CSCve93833, CSCve93860, CSCve93863, CSCve93864, CSCve93880.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A command injection vulnerability in the CLI parser of Cisco FXOS and NX-OS System Software allows an authenticated local attacker to inject crafted command arguments due to insufficient input validation. Successful exploitation permits execution of arbitrary commands at the user's privilege level.

MitigationApply Cisco software updates addressing CSCve51700, CSCve93833, CSCve93860, CSCve93863, CSCve93864, CSCve93880. Restrict local CLI access to trusted, authorized personnel only.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Nx OsOperating system
Affected:= 5.2\(1\)sv3\(2.8\)= 8.0\(1\)= 8.1\(0\)bd\(0.20\)= 8.1\(0.2\)s0
Unified Computing SystemApplication
Affected:= 7.0\(0\)hsk\(0.357\)
Firepower Extensible Operating SystemOperating system
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the installed product and version
    Run 'show version' on NX-OS or 'show fxos version' on Firepower/FXOS appliances to obtain the software version
    Affected if The version matches any of these: Cisco NX-OS 5.2(1)sv3(2.8), 8.0(1), 8.1(0)bd(0.20), 8.1(0.2)s0; Cisco UCS 7.0(0)hsk(0.357); or any version of Cisco Firepower Extensible Operating System (FXOS)
  2. Confirm CLI access is available
    Verify you can access the CLI shell via console, SSH, ortelnet by attempting to log in
    Affected if CLI access is enabled and you have valid authentication credentials
  3. Check for untrusted local user accounts
    Run 'show users' or 'show running-config' to list configured local accounts and recent login sessions
    Affected if There are local user accounts beyond the intended administrators, or sessions from untrusted source IP addresses exist
  4. Identify privilege level of your account
    After logging into the CLI, run 'show privilege' or check your current prompt level
    Affected if Your account operates at any privilege level (including user mode) since the vulnerability allows command injection at the user's current privilege level

You are affected if you run any of the specific NX-OS versions listed, UCS 7.0(0)hsk(0.357), or any version of Firepower FXOS, and your CLI is accessible to untrusted authenticated local users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply Cisco software updates addressing CSCve51700, CSCve93833, CSCve93860, CSCve93863, CSCve93864, CSCve93880. Restrict local CLI access to trusted, authorized personnel only.

Fix this in Nx Os Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2017-12329 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data