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Unified Computing SystemApplication · Cisco

CVE-2015-0718

HIGH · 7.5 CVSS v3.0 Published 2016-03-03
Fix available
A fix is available. Upgrade to 2.50 / 2017-01-06 or later.
See remediation →
84/100
Remediation priority · High
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
Cisco NX-OS 4.0 through 6.1 on Nexus 1000V 3000, 4000, 5000, 6000, and 7000 devices and Unified Computing System (UCS) platforms allows remote attackers to cause a denial of service (TCP stack reload) by sending crafted TCP packets to a device that has a TIME_WAIT TCP session, aka Bug ID CSCub70579.

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

This CVE describes a denial-of-service vulnerability in Cisco NX-OS versions 4.0 through 6.1 across multiple Nexus and UCS platforms. Remote attackers can send crafted TCP packets to a device that has a TIME_WAIT TCP session, causing the TCP stack to reload and resulting in service disruption.

MitigationApply the applicable Cisco software updates for NX-OS that address CSCub70579. In the interim, restrict network access to affected devices using firewalls or ACLs to limit exposure to untrusted sources.

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
Unified Computing SystemApplication
Affected:= 1.4_1i= 1.4_1j= 1.4_1m= 1.4_3i= 1.4_3l= 1.4_3m= 1.4_3q= 1.4_3s= 1.4_3u= 1.4_3y= 1.4_4f= 1.4_4g
Nx OsOperating system
Affected:= base
Jr6150 FirmwareOperating system
Affected:< 2017-01-06
X14j FirmwareOperating system
Affected:= t-ms14jakucb-1102.5
OpensolarisOperating system
Affected:= snv_124
Gs1900 10hp FirmwareOperating system
Affected:< 2.50\(aazi.0\)c0
Keymouse FirmwareOperating system
Affected:= 3.08

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
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 device product and NX-OS version
    Run 'show version' on the Cisco Nexus device or check the UCS firmware version via 'show system firmware'
    Affected if The device runs Cisco NX-OS version 4.x, 5.x, or 6.0-6.1, or Cisco UCS version matching any of: 1.4_1i, 1.4_1j, 1.4_1m, 1.4_3i, 1.4_3l, 1.4_3m, 1.4_3q, 1.4_3s, 1.4_3u, 1.4_3y, 1.4_4f, 1.4_4g
  2. Verify TCP services are exposed
    Check if the device has any TCP-based management or application services enabled and reachable from network (run 'show ip interface brief' and review active TCP listeners)
    Affected if Any TCP-based service (SSH, Telnet, HTTP, HTTPS, or other TCP applications) is enabled and accessible from untrusted networks
  3. Confirm presence of TIME_WAIT sessions
    Run 'show tcp brief' or 'show connections' to see active TCP connections, particularly look for connections in TIME_WAIT state
    Affected if The device has any TCP connections in TIME_WAIT state; the vulnerability is triggered when crafted packets are sent to a device with existing TIME_WAIT sessions
  4. Check for recent unexpected reloads
    Review system logs and run 'show system reset-reason' or 'show logging log' to identify any unexplained reloads
    Affected if The device has experienced unexplained reloads or crashes that coincide with network activity from untrusted sources

The environment is affected if the device runs Cisco NX-OS 4.0-6.1 or the specific Cisco UCS versions listed, has TCP services exposed, and maintains TIME_WAIT TCP sessions, making it vulnerable to crafted packets causing reloads.

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
Upgrade available Upgrade to 2.50 / 2017-01-06 or later
Fixed in 2.502017-01-06
Interim mitigation

Apply the applicable Cisco software updates for NX-OS that address CSCub70579. In the interim, restrict network access to affected devices using firewalls or ACLs to limit exposure to untrusted sources.

Fix this in Unified Computing System Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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Scan for this in your stack

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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-2015-0718 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