Iot Field Network DirectorApplication · Cisco
CVE-2019-1644
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 UDP protocol implementation for Cisco IoT Field Network Director (IoT-FND) could allow an unauthenticated, remote attacker to exhaust system resources, resulting in a denial of service (DoS) condition. The vulnerability is due to improper resource management for UDP ingress packets. An attacker could exploit this vulnerability by sending a high rate of UDP packets to an affected system within a short period of time. A successful exploit could allow the attacker to exhaust available system resources, 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 vulnerability in the UDP protocol implementation for Cisco IoT Field Network Director allows an unauthenticated remote attacker to exhaust system resources by sending a high rate of UDP packets. The vulnerability stems from improper resource management for incoming UDP packets, which can lead to complete 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
Iot Field Network DirectorApplication
= 4.3\(0.20\)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:3.1/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 checksWork through these to decide whether this CVE applies to you.
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Identify installed version of Cisco IoT Field Network DirectorUse the command 'show version' or check the product's web interface under About/Help to determine the exact software version installedAffected if The installed version is exactly 4.3(0.20)
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Verify UDP service is listeningRun 'netstat -an | grep UDP' or 'ss -ulpn' on the system to check for UDP listeners associated with the Cisco IoT Field Network Director servicesAffected if UDP ports are open and listening for the product
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Check UDP traffic exposureReview firewall rules and network ACLs to determine if UDP traffic can reach the affected system from untrusted networks. Use 'show ip interface' or check firewall configurationAffected if The system UDP interfaces are accessible from outside trusted networks
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Monitor for UDP-related resource exhaustionCheck system resources using 'top', 'vmstat 1', or platform-specific monitoring to identify unusual memory or CPU consumption that may indicate the UDP resource exhaustion conditionAffected if System resources are being exhausted under normal UDP traffic conditions
The environment is affected only if Cisco IoT Field Network Director version 4.3(0.20) is installed AND the system is exposed to incoming UDP traffic from network sources.
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 vendor patch from Cisco when available. In the interim, implement network-level rate limiting or firewall rules to restrict UDP traffic to the affected system.
Fix this in Iot Field Network Director
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-1644 — 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-2019-1644 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
- No weaponised exploit code, or anything meant to cause harm
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