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CVE Record

CVE-2020-3354: Cisco Data Center Network Manager Stored Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Data Center Network Manager (DCNM) could allow an authenticated, remote attacker with administrative credentials to conduct a cross-site scripting (XSS) attack against a user of the interface. The vulnerability is due to insufficient input validation by the web-based management interface. An attacker could exploit this vulnerability by inserting malicious data into a specific data field in the interface. 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. To exploit this vulnerability, the attacker would need administrative credentials on the affected device.

MediumCVSS 4.8Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-3354 is a stored cross-site scripting issue in Cisco Data Center Network Manager. An authenticated administrator could save malicious content in the web interface, causing script execution when another interface user views it. Business impact is limited by the need for admin credentials, but it still threatens management-console trust and browser-held sensitive information.

Executive priority

Treat as a controlled remediation item, not an emergency, unless DCNM administration is poorly restricted or shared admin accounts exist. Prioritize confirming exposure and applying Cisco guidance because compromise of a network management console can support broader operational risk.

Technical view

The flaw is CWE-79 in DCNM's web-based management interface, caused by insufficient input validation. Exploitation is remote but requires high privileges and user interaction. CVSS v3.0 is 4.8 with low confidentiality and integrity impact, no availability impact, and changed scope.

Likely exposure

Exposure is most likely in organizations running Cisco Data Center Network Manager with web interface access available to administrators. The source bundle does not identify affected version ranges, so exposure must be checked against Cisco's advisory and local asset inventory.

Exploitation context

The source bundle does not show active exploitation, and the CVE is not listed as KEV. Exploitation requires administrative credentials on the affected device and a victim user interacting with the affected interface content.

Researcher notes

Evidence supports stored XSS only in Cisco DCNM's web-based management interface. The bundle does not provide affected version ranges, patched versions, or public exploit evidence. Avoid assuming unauthenticated impact; the stated prerequisite is administrative credentials.

Mitigation direction

  • Review Cisco's advisory for affected releases and fixed software guidance.
  • Inventory Cisco DCNM deployments and confirm ownership.
  • Restrict DCNM management access to trusted administrative networks.
  • Remove unnecessary DCNM administrative accounts.
  • Review recent DCNM configuration and interface content changes.

Validation and detection

  • Confirm installed DCNM versions against Cisco's advisory.
  • Verify only approved administrators can access the DCNM web interface.
  • Check administrative accounts for unexpected privilege assignments.
  • Inspect relevant interface data fields for suspicious stored content.
  • Review DCNM logs for unusual administrative changes.
Prepared
Confidence
medium
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-3354 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.8CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.8Medium
CVSS 3.0 vector shape for CVE-2020-3354Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Data Center Network Managern/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.