Application Policy Infrastructure Controller Enterprise ModulePlugin / extension · Cisco
CVE-2018-0427
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 CronJob scheduler API of Cisco Digital Network Architecture (DNA) Center could allow an authenticated, remote attacker to perform a command injection attack. The vulnerability is due to incorrect input validation of user-supplied data. An attacker could exploit this vulnerability by sending a malicious packet. A successful exploit could allow the attacker to execute arbitrary commands with root privileges. Cisco Bug IDs: CSCvi42263.
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 confidenceA command injection vulnerability exists in the CronJob scheduler API of Cisco DNA Center due to insufficient input validation of user-supplied data. An authenticated remote attacker can send specially crafted malicious packets to inject and execute arbitrary operating system commands with root privileges. The vulnerability is triggered through the scheduler's API interface, allowing full system compromise.
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
Application Policy Infrastructure Controller Enterprise ModulePlugin / extension
= dnac1.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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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Confirm Cisco DNA Center installationIdentify if the system is running Cisco DNA Center or Cisco Application Policy Infrastructure Controller Enterprise Module. Check for the presence of DNA Center management interface or the dnac process.Affected if System is running Cisco DNA Center or Cisco APIC Enterprise Module
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Check installed versionAccess the DNA Center administration interface or use the command line to determine the exact version number. Compare against the affected version dnac1.1.Affected if Installed version is exactly dnac1.1
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Verify CronJob scheduler API accessibilityCheck if the scheduler API endpoint is exposed and accessible. Review network configuration to determine if the DNA Center management interface is reachable from the network.Affected if Scheduler API is accessible externally or from untrusted networks
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Review API access logsExamine DNA Center logs for API calls to the scheduler endpoint. Look for unusual or suspicious API requests, especially those containing shell metacharacters or unexpected parameters.Affected if Logs show anomalous scheduler API calls or commands not initiated by authorized administrators
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Check for unauthorized command executionReview system logs, process logs, and authentication records for evidence of unexpected command execution, especially as root or with elevated privileges.Affected if Evidence exists of arbitrary command execution that did not originate from documented administrative actions
A user is affected if they are running Cisco DNA Center version dnac1.1 with the scheduler API accessible to authenticated attackers, and especially if logs show suspicious API activity or unauthorized command execution.
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 patch for bug CSCvi42263 as soon as possible. Until the patch is deployed, limit access to the DNA Center management interface to trusted administrators only and monitor for suspicious API activity.
Fix this in Application Policy Infrastructure Controller Enterprise Module
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,192.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0427 — 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-2018-0427 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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