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.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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 lookupCVE-2020-3354 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.8MediumVector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20200617 Cisco Data Center Network Manager Stored Cross-Site Scripting VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
