Security readout for executives and security teams
Plain-English summary
CVE-2020-3349 is a set of cross-site scripting flaws in Cisco DCNM's web management interface. An authenticated attacker could trick an interface user into opening a crafted link, causing script to run in that user's browser session. Business impact is limited but relevant for environments where DCNM manages critical data center networks.
Executive priority
Treat this as a moderate-priority management-plane issue. It is not reported as actively exploited in the supplied sources, but DCNM can administer important data center infrastructure, so owners should validate versions and apply Cisco guidance during normal security maintenance.
Technical view
The vulnerabilities are CWE-79 XSS issues caused by insufficient validation of user-supplied input in Cisco Data Center Network Manager. The CVSS 3.0 score is 4.8 with network attack vector, high privileges required, user interaction required, changed scope, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is likely limited to organizations running Cisco Data Center Network Manager with its web interface available to authenticated users. The supplied bundle does not identify exact affected versions, CPEs, or deployment modes, so asset and version validation must use Cisco's advisory.
Exploitation context
The source bundle describes a social-engineering XSS scenario requiring an authenticated remote attacker and a user click. It could execute script in the management interface context or access sensitive browser-based information. CISA KEV status is false, and no supplied source states active exploitation.
Researcher notes
Key constraints are PR:H and UI:R, making this less likely to be a broad unauthenticated compromise path. Research should focus on version mapping, interface exposure, role requirements, and whether user sessions have elevated DCNM privileges. The supplied evidence does not include exploit details or fixed-version data.
Mitigation direction
- Review Cisco's advisory for affected and fixed DCNM releases.
- Apply Cisco-provided upgrade or remediation guidance where applicable.
- Restrict DCNM web interface access to trusted management networks.
- Limit DCNM accounts to users who require administrative access.
- Train DCNM users to avoid unsolicited management-interface links.
Validation and detection
- Inventory Cisco Data Center Network Manager deployments and exposed web interfaces.
- Confirm installed DCNM versions against Cisco's advisory.
- Review whether DCNM access requires authentication and trusted network paths.
- Check browser-facing security monitoring for unusual DCNM link activity.
- Verify remediation status after applying Cisco guidance.
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-2020-3349 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
- 20200715 Cisco Data Center Network Manager Cross-Site Scripting VulnerabilitiesCVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.