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.
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-2020-3355 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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.
