Security readout for executives and security teams
Plain-English summary
Cisco DCNM’s web management interface had an input-validation flaw that could let a logged-in attacker trick another user into opening a malicious link. If successful, script could run inside the DCNM interface and expose browser-based information or affect actions in that session.
Executive priority
Treat as a moderate management-plane risk. It is not reported as exploited, but compromise of a network-management interface can create operational exposure if administrators are targeted.
Technical view
CVE-2020-3523 is a CWE-79 cross-site scripting issue in Cisco Data Center Network Manager. The source states exploitation requires authentication, network reachability, and user interaction. CVSS 3.1 score is 6.5 with changed scope and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Cisco DCNM web management interfaces are reachable by authenticated users. The bundle does not provide affected version ranges, so inventory and vendor-advisory comparison are required.
Exploitation context
The bundle does not report active exploitation, and KEV is false. Exploitation depends on an authenticated attacker persuading a user of the management interface to click a crafted link.
Researcher notes
Key constraints are PR:L and UI:R, so validation should focus on authenticated UI exposure and user-targeting risk. The source bundle lacks affected version and fixed-version details; avoid assumptions beyond the Cisco advisory.
Mitigation direction
- Review Cisco’s advisory for affected and fixed release guidance.
- Update affected Cisco DCNM deployments using vendor-supported instructions.
- Restrict DCNM management interface access to trusted administrative networks.
- Remind DCNM users not to open untrusted management-interface links.
Validation and detection
- Inventory Cisco DCNM deployments and exposed web management interfaces.
- Compare installed DCNM versions against Cisco advisory guidance.
- Confirm management UI access is limited to authorized users.
- Review recent DCNM user activity for suspicious browser-driven actions.
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-2020-3523 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20200819 Cisco Data Center Network Manager 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.
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.