Data Center Network ManagerApplication · Cisco
CVE-2021-1133
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 · uneditedMultiple vulnerabilities in the REST API endpoint of Cisco Data Center Network Manager (DCNM) could allow an authenticated, remote attacker to view, modify, and delete data without proper authorization. For more information about these vulnerabilities, see the Details section of this advisory.
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 confidenceMultiple broken access control vulnerabilities in the REST API of Cisco Data Center Network Manager allow authenticated attackers to perform unauthorized read, write, and delete operations on data outside their intended permissions scope. This is an authorization bypass in the API layer affecting the authentication mechanism.
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
Data Center Network ManagerApplication
< 11.4\(1\)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
- Low
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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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Identify Cisco DCNM installationConfirm the system is running Cisco Data Center Network Manager by checking for the DCNM web interface or querying the installed software packageAffected if DCNM software is present on the system
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Check DCNM versionAccess the DCNM web UI (typically at /datacenter) or use CLI to query the installed DCNM version against the version stringAffected if Installed version is earlier than 11.4(1)
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Verify REST API accessibilityAttempt to reach the DCNM REST API endpoint (typically /api/ resources) from the management network to confirm API is exposedAffected if REST API responds to requests without additional authentication beyond baseline login
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Review API access logsInspect DCNM audit logs or API access logs for authenticated sessions performing operations outside the user's assigned role permissionsAffected if Logs show authenticated users accessing data or performing actions outside their documented authorization scope
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Check management network exposureVerify whether DCNM management interfaces are accessible from networks other than trusted administration IPsAffected if DCNM management interface is reachable from untrusted networks
Environment is affected if running Cisco Data Center Network Manager version earlier than 11.4(1) with REST API accessible and the system accepts authenticated sessions that can bypass authorization controls.
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 data11.4
Apply Cisco's official patches for DCNM. In the interim, restrict network access to DCNM management interfaces to trusted administration IPs and monitor API access logs for anomalous authorized-but-unauthorized activity patterns.
Fix this in Data Center Network Manager
Scoped from the published advisory
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1133 — 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-2021-1133 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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