Iot Field Network DirectorApplication · Cisco
CVE-2026-20167
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 web-based management interface of Cisco IoT Field Network Director could allow an authenticated, remote attacker with low privileges to cause a DoS condition on a remotely managed router. This vulnerability is due to improper error handling. An attacker could exploit this vulnerability by submitting crafted input to the web-based management interface. A successful exploit could allow the attacker to request unauthorized files from a remote router, causing the router to reload and 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 Cisco IoT Field Network Director's web-based management interface allows an authenticated attacker with low privileges to submit crafted input that requests unauthorized files from remotely managed routers. This improper error handling causes the affected routers to reload, resulting in a denial of service condition.
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
< 5.0.0-117CVSS 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
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 installed version of Cisco IoT Field Network DirectorLocate the version information through the product's web interface under 'About' or 'System Information', or check via CLI if available in your deployment documentationAffected if The installed version is lower than 5.0.0-117
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Determine if the web-based management interface is accessibleVerify whether the web-based management interface is exposed to network access, either internally or externallyAffected if The web interface is reachable from any network where untrusted users could potentially access it
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Review user accounts with low-privilege accessCheck the user management or authentication settings to identify accounts that have low-level or restricted privilegesAffected if There are any user accounts with authenticated access, regardless of privilege level, as the vulnerability can be exploited with low privileges
You are affected if your Cisco IoT Field Network Director version is below 5.0.0-117 and the web-based management interface is accessible to authenticated users.
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.
dbcve · scoped5.0.0-117
Apply the vendor-provided patch or update to Cisco IoT Field Network Director when available. Until then, limit access to the web-based management interface to trusted users only and monitor for unusual file request patterns.
5.0.0-117 or later
- 1. Back up the current Cisco IoT Field Network Director configuration and database
- 2. Review Cisco IoT Field Network Director release notes for version 5.0.0-117 for any specific upgrade requirements
- 3. Download Cisco IoT Field Network Director version 5.0.0-117 or later from the Cisco Software Download page
- 4. Stop all IoT Field Network Director services before upgrading
- 5. Install the version 5.0.0-117 update following Cisco's standard installation procedure
- 6. Verify the upgrade was successful by checking the version in the web-based management interface
- 7. Confirm that the web-based management interface is accessible and functioning normally
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Iot Field Network Director
Scoped from the published advisory
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 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 $3,392.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20167 — 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-2026-20167 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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