LiveActive security incident?Get immediate response
CVE Record

CVE-2020-3355: 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

Cisco DCNM’s admin web interface can store malicious script entered by an authenticated administrator. When another interface user views the affected data, script may run in their browser. Business risk is limited by the need for admin credentials and user interaction, but DCNM is a sensitive network-management platform.

Executive priority

Treat as a controlled but real administrative-platform risk. It is not marked as known exploited in the provided sources, but DCNM’s role in data center management justifies timely validation and vendor-guided remediation.

Technical view

CVE-2020-3355 is a stored XSS in Cisco Data Center Network Manager caused by insufficient input validation in the web-based management interface. Exploitation requires remote administrative credentials and user interaction, and may allow script execution in the affected interface context or access to sensitive browser-based information.

Likely exposure

Exposure is limited to organizations running Cisco Data Center Network Manager with reachable web management access. The provided sources do not identify affected versions or CPEs, so inventory confirmation must use Cisco’s advisory and local asset records.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Attack prerequisites are significant: administrative credentials on the affected device plus a victim user viewing the stored interface data.

Researcher notes

Key constraints are PR:H, UI:R, S:C, with low confidentiality and integrity impact and no availability impact. The source bundle lacks affected version ranges and patch details, so do not expand scope beyond Cisco DCNM without vendor confirmation.

Mitigation direction

  • Review Cisco’s advisory for affected releases and fixed software guidance.
  • Restrict DCNM web management access to trusted administrative networks.
  • Audit and reduce DCNM administrative accounts to least privilege.
  • Prioritize updates if DCNM manages sensitive data center network infrastructure.

Validation and detection

  • Confirm whether Cisco Data Center Network Manager is deployed.
  • Check DCNM version and compare it with Cisco advisory guidance.
  • Review administrative access paths to the web management interface.
  • Look for unexpected administrative content changes in DCNM interface fields.
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-2020-3355 mapping review

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

Open ATT&CK lookup
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-2020-3355Attack 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.