iOSOperating system · Cisco
CVE-2018-0466
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 · uneditedA vulnerability in the Open Shortest Path First version 3 (OSPFv3) implementation in Cisco IOS and IOS XE Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload. The vulnerability is due to incorrect handling of specific OSPFv3 packets. An attacker could exploit this vulnerability by sending crafted OSPFv3 Link-State Advertisements (LSA) to an affected device. An exploit could allow the attacker to cause an affected device to reload, leading to a denial of service (DoS) condition.
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 confidenceA vulnerability in Cisco IOS and IOS XE Software's OSPFv3 implementation allows an unauthenticated, adjacent attacker to send specially crafted Link-State Advertisements (LSAs) that cause the affected device to reload, resulting in denial of service.
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
iOSOperating system
= 16.2.1
Ios XeOperating system
= 16.2.1CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:A/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 checksWork through these to decide whether this CVE applies to you.
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Determine the Cisco IOS or IOS XE versionConnect to the device CLI and run 'show version' to display the running software version. Look for the version number in the output (for example, 16.2.1, 16.3.1, etc.).Affected if The installed version is 16.2.1 or any earlier 16.x release, or any 15.x release that maps to the affected version range.
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Confirm OSPFv3 is configuredRun 'show running-config | include ospfv3' or 'show ip ospf3' to check if OSPFv3 routing process is enabled on the device.Affected if OSPFv3 is actively configured on the device.
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Identify OSPFv3 enabled interfacesRun 'show ospf3 interface' to list all interfaces where OSPFv3 is enabled and active.Affected if OSPFv3 is running on any interface, making the device vulnerable to crafted LSA injection.
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Verify network accessibility to adjacent attackersReview interface configurations and network topology to determine if untrusted adjacent devices can reach the OSPFv3-enabled interfaces (for example, access layer ports, trunk ports connecting to untrusted segments).Affected if The device has OSPFv3 enabled on interfaces accessible to untrusted adjacent network segments.
The device is affected if it runs a version in the affected range (16.2.1 or earlier for the 16.x train), has OSPFv3 enabled, and OSPFv3 interfaces are reachable from untrusted adjacent network segments.
Generated from the published advisory. Verify against your own configuration.
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 dataApply the relevant Cisco security update (refer to Cisco advisory) to affected IOS/IOS XE devices. Consider implementing OSPFv3 traffic filtering on upstream interfaces to block unauthorized LSA injection from untrusted segments.
Fix this in iOS
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0466 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-0466 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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