Ios XeOperating system · Cisco
CVE-2020-3414
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 packet processing of Cisco IOS XE Software for Cisco 4461 Integrated Services Routers could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incorrect processing of IPv4 or IPv6 traffic to or through an affected device. An attacker could exploit this vulnerability by sending IP traffic to or through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a 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 packet processing vulnerability in Cisco IOS XE Software on Cisco 4461 ISR allows an unauthenticated remote attacker to cause device reload by sending specially crafted IPv4 or IPv6 traffic through or to the affected router, 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
Ios XeOperating system
= 16.9.2= 16.10.4= 16.11.2= 16.12.3= 17.1.1CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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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Identify the device modelRun 'show version' or 'show inventory' to confirm the hardware is a Cisco 4461 ISRAffected if The device model is Cisco 4461 ISR
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Check the IOS XE versionRun 'show version' and locate the IOS XE release string (for example, 16.9.2, 16.10.4, 16.11.2, 16.12.3, or 17.1.1)Affected if The installed IOS XE version matches 16.9.2, 16.10.4, 16.11.2, 16.12.3, or 17.1.1 exactly
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Verify IPv4 or IPv6 processing is enabledRun 'show ip interface brief' and 'show ipv6 interface brief' to confirm at least one IP protocol is active on any interfaceAffected if IPv4 or IPv6 interfaces are configured and up
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Check interface exposure to untrusted networksReview interface configurations with 'show run interface' to identify if WAN, loopback, or management interfaces are reachable from outside the trusted networkAffected if Any interface with an IP address is directly accessible from untrusted networks (such as the internet)
A user is affected if they run a Cisco 4461 ISR with IOS XE version 16.9.2, 16.10.4, 16.11.2, 16.12.3, or 17.1.1 and have IPv4 or IPv6 interfaces that can receive specially crafted packets from an attacker.
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 Cisco IOS XE software update addressing CVE-2020-3414; until then, consider implementing ACLs or traffic filtering to block suspicious IP packets at network edges.
Fix this in Ios Xe
Scoped from the published advisory
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3414 — 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-2020-3414 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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