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Ios XrOperating system · Cisco

CVE-2016-1433

MEDIUM · 5.3 CVSS v3.0 Published 2016-09-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
62/100
Remediation priority · Elevated
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 IOS XR 6.0 and 6.0.1 on NCS 6000 devices allows remote attackers to cause a denial of service (OSPFv3 process reload) via crafted OSPFv3 packets, aka Bug ID CSCuz66289.

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 denial of service vulnerability in Cisco IOS XR 6.0 and 6.0.1 on NCS 6000 devices allows remote attackers to send crafted OSPFv3 packets that cause the OSPFv3 routing process to reload, disrupting OSPFv3 routing services.

MitigationApply the Cisco IOS XR software update that addresses this vulnerability. As a temporary measure, implement ingress filtering or ACLs to limit OSPFv3 packets from untrusted sources until the patch can be applied.

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
Ios XrOperating system
Affected:= 6.0.0= 6.0.1= 6.0_base

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
Low

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 hardware platform
    Run 'show platform' or check the chassis model to confirm the device is an NCS 6000 series router
    Affected if The device is an NCS 6000 series platform
  2. Check the IOS XR software version
    Run 'show version' and locate the IOS XR release line. Compare the version number against the affected ranges: 6.0.0, 6.0.1, or 6.0_base
    Affected if The installed version is 6.0.0, 6.0.1, or 6.0_base
  3. Verify OSPFv3 is configured
    Run 'show ospfv3 vrf all-instance' or examine the running configuration for any 'router ospfv3' entries
    Affected if OSPFv3 routing process is configured and active
  4. Check OSPFv3 interface bindings
    Run 'show ospfv3 interface' to list all interfaces where OSPFv3 is enabled
    Affected if OSPFv3 is enabled on any interface, particularly those facing untrusted networks

The device is affected if it is an NCS 6000 running IOS XR version 6.0.0, 6.0.1, or 6.0_base with OSPFv3 configured and exposed to network traffic.

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 the Cisco IOS XR software update that addresses this vulnerability. As a temporary measure, implement ingress filtering or ACLs to limit OSPFv3 packets from untrusted sources until the patch can be applied.

Fix this in Ios Xr Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
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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-2016-1433 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