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Nx OsOperating system · Cisco

CVE-2018-0310

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-21
Fix available
A fix is available. Upgrade to 1.1.4.179 / 2.0.1.153 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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 Cisco Fabric Services component of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to obtain sensitive information from memory or cause a denial of service (DoS) condition on the affected product. The vulnerability exists because the affected software insufficiently validates header values in Cisco Fabric Services packets. An attacker could exploit this vulnerability by sending a crafted Cisco Fabric Services packet to an affected device. A successful exploit could allow the attacker to cause a buffer overread condition, which could allow the attacker to obtain sensitive information from memory or cause a DoS condition on the affected product. This vulnerability affects Firepower 4100 Series Next-Generation Firewalls, Firepower 9300 Security Appliance, MDS 9000 Series Multilayer Switches, Nexus 2000 Series Fabric Extenders, Nexus 3000 Series Switches, Nexus 3500 Platform 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, UCS 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCvd69957, CSCve02435, CSCve04859, CSCve41536, CSCve41538, CSCve41559.

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 buffer overread vulnerability in Cisco Fabric Services component of FXOS and NX-OS software allows unauthenticated remote attackers to send crafted packets with insufficiently validated header values, potentially exposing sensitive memory contents or causing denial of service.

MitigationApply Cisco firmware patches referenced in the associated bug IDs (CSCvd69957, CSCve02435, etc.) to affected devices. If patching is not immediately possible, restrict network access to Cisco Fabric Services ports via firewall rules or network segmentation.

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:= 7.0\(0\)hsk\(0.357\)= 8.1\(0.2\)s0= 8.8\(0.1\)= 8.0\(1\)= 8.8\(3.5\)s0= 7.0\(3\)i4\(7\)= 7.0\(3\)i7\(1\)= 3.1\(3a\)a= 9.9\(0.902\)
Firepower Extensible Operating SystemOperating system
Affected:>= 1.1, < 1.1.4.179>= 2.0, < 2.0.1.153>= 2.1.1, < 2.1.1.86>= 2.2.1, < 2.2.1.70>= 2.2.2, < 2.2.2.17

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

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 product and OS version
    Run 'show version' on the device CLI to obtain the Cisco NX-OS or FXOS version number
    Affected if The version displayed matches any of the affected versions listed in the CVE (7.0(0)hsk(0.357), 8.1(0.2)s0, 8.8(0.1), 8.0(1), 8.8(3.5)s0, 7.0(3)i4(7), 7.0(3)i7(1), 3.1(3a)a, 9.9(0.902) for NX-OS or falls within FXOS ranges 1.1 to 1.1.4.179, 2.0 to 2.0.1.153, 2.1.1 to 2.1.1.86, 2.2.1 to 2.2.1.70, or
  2. Confirm Cisco Fabric Services is enabled
    Run 'show feature' or 'show running-config | include fabric' to check if Cisco Fabric Services feature is enabled on the device
    Affected if The Cisco Fabric Services feature shows as enabled or configured in the device configuration
  3. Verify the management interface exposure
    Check if the device management interface (mgmt0) or fabric services ports are accessible from untrusted networks by reviewing the device ACLs or firewall rules with 'show ip access-lists'
    Affected if The Cisco Fabric Services component is reachable from network segments that are not explicitly trusted or isolated

The device is likely affected if it runs an NX-OS or FXOS version matching the affected ranges AND has Cisco Fabric Services enabled and accessible.

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.

dbcve · scoped
Upgrade available Upgrade to 1.1.4.179 / 2.0.1.153 / 2.1.1.86 or later
Fixed in 1.1.4.1792.0.1.1532.1.1.86
Interim mitigation

Apply Cisco firmware patches referenced in the associated bug IDs (CSCvd69957, CSCve02435, etc.) to affected devices. If patching is not immediately possible, restrict network access to Cisco Fabric Services ports via firewall rules or network segmentation.

Recommended fix Moderate confidence

Cisco NX-OS and FXOS software releases containing fixes for CVE-2018-0310 (specific version depends on product platform; obtain from Cisco advisory at tools.cisco.com)

  1. 1. Identify the exact Cisco NX-OS or FXOS version running on the affected device using 'show version' command.
  2. 2. Determine the specific product model (Nexus 3000/3500/5500/5600/6000/7000/7700/9000 Series, MDS 9000, Firepower 4100/9300, or UCS Fabric Interconnects).
  3. 3. Consult the official Cisco security advisory for CVE-2018-0310 on tools.cisco.com to obtain the exact fixed release for your product and current version.
  4. 4. Download the appropriate fixed Cisco NX-OS or FXOS software release from Cisco.com.
  5. 5. Plan maintenance window as upgrades may require device reload.
  6. 6. Back up current device configuration.
  7. 7. Upload the fixed software image to the device.
  8. 8. Install the upgrade following standard Cisco NX-OS/FXOS upgrade procedures.
Caveat Software upgrade may require device reload and could have compatibility implications; test in lab environment before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Nx Os Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
36.0 hours of engineering $6,400
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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-2018-0310 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