Iot Field Network DirectorApplication · Cisco
CVE-2026-20169
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 access files and execute commands on a remote router. This vulnerability is due to insufficient input validation of user-supplied data. An attacker could exploit this vulnerability by submitting crafted input in the web-based management interface. A successful exploit could allow the attacker to create, read, or delete files and execute limited commands in user EXEC mode on a remote router.
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 · moderate confidenceThis is an input validation vulnerability in Cisco IoT Field Network Director's web-based management interface. An authenticated attacker with low privileges can submit specially crafted input to create, read, or delete files and execute limited commands in user EXEC mode on connected remote routers. The vulnerability stems from the application failing to properly validate user-supplied data before using it in file operations or command execution contexts.
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
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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 Cisco IoT Field Network Director installationLocate the installation directory or check running services for 'IoT Field Network Director' or 'IoT-FND' components. Common locations include /opt/cisco/iot-fnd or checking for the fndService process.Affected if The software is installed and running on the system
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Determine installed versionCheck the version of Cisco IoT Field Network Director. Typically found in the software's about page, version file, or by querying the management interface. Common methods: cat /opt/cisco/iot-fnd/version or accessing the web UI and navigating to Help > About.Affected if The version is less than 5.0.0-117
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Verify web-based management interface is enabledCheck if the web management interface port (default 443 or 8443) is listening and accessible. Use 'netstat -an | grep -E "(443|8443)"' or check the configuration file for webUI enabled status.Affected if The web-based management interface is enabled and reachable on the network
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Confirm low-privilege user access to web UITest authentication with a low-privilege account (non-admin user) to determine if the web management interface accepts low-privilege credentials.Affected if Low-privilege authenticated users can access the web interface
A system is affected if Cisco IoT Field Network Director version is less than 5.0.0-117 AND the web-based management interface is accessible to authenticated low-privilege 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 Cisco's available patches for this vulnerability. Until patched, restrict access to the web-based management interface to trusted users only and implement network segmentation to limit exposure of connected routers.
Upgrade to Cisco IoT Field Network Director version 5.0.0-117 or later (e.g., latest available 5.x release)
- 1. Identify the current version of Cisco IoT Field Network Director by accessing the web-based management interface or using the CLI command to display the version.
- 2. Confirm the current version is below 5.0.0-117, which is the vulnerable version range.
- 3. Backup all current configuration files and data according to Cisco backup procedures for IoT Field Network Director.
- 4. Download the fixed version (5.0.0-117 or later) from the Cisco Software Download page on cisco.com or your authorized Cisco channel.
- 5. Schedule a maintenance window as upgrades may require brief downtime.
- 6. Follow Cisco's documented upgrade procedure for IoT Field Network Director, typically involving accessing the administration interface and uploading the new software image.
- 7. After upgrade completes, verify the version shows 5.0.0-117 or higher in the management interface.
- 8. Test that the web-based management interface functions normally and that authenticated users can only perform actions appropriate to their privilege level.
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Iot Field Network Director
Scoped from the published advisory
- Consultation6.0 h
- Implementation12.0 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 $7,968.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-20169 — 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-2026-20169 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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- Version or environment caveats, and links to real fixes
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