Data Center Network ManagerApplication · Cisco
CVE-2020-3460
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 Data Center Network Manager (DCNM) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by intercepting a request from a user and injecting malicious data into an HTTP header. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive browser-based information.
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 reflected cross-site scripting (XSS) vulnerability in Cisco Data Center Network Manager (DCNM) allows unauthenticated remote attackers to inject malicious script into HTTP headers. The web-based management interface fails to properly validate user-supplied input, causing the injected payload to be reflected back to users, enabling arbitrary code execution in the context of the affected interface or theft of sensitive browser-based information.
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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 if Cisco DCNM is installedCheck for DCNM installation directories (e.g., /opt/dcnm, /usr/local/cisco/dcnm) or look for the 'dcnm' service using 'systemctl list-units --type=service | grep -i dcnm' or 'ps aux | grep -i dcnm'Affected if DCNM software is present on the system
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Determine the installed DCNM versionCheck the DCNM version file if it exists (commonly found in the installation directory as 'version' or 'dcnm_version'), or access the web interface and look for version information in the login page or About section, or run 'dcnm歌唱 -v' if the command-line tool is availableAffected if The installed version is lower than 11.4(1)
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Verify the DCNM web management interface is accessibleCheck if the web service is running by inspecting listening ports (e.g., 'netstat -tulpn | grep -E "(80|443|8080|8443)"' or 'ss -tulpn'), and confirm DCNM web interface responds to HTTP/HTTPS requestsAffected if The web management interface is exposed and responsive
A system is affected if Cisco DCNM is installed with a version lower than 11.4(1) and the web-based management interface is accessible, as the reflected XSS vulnerability exists in that configuration.
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 the vendor patch from Cisco for CVE-2020-3460. If immediate patching is not feasible, restrict network access to the DCNM web management interface to trusted sources only.
Fix this in Data Center Network Manager
Scoped from the published advisory
- Consultation3.0 h
- Implementation4.0 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 $3,648.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3460 — 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-2020-3460 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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