Security readout for executives and security teams
Plain-English summary
CVE-2020-3539 lets a low-privileged authenticated user in Cisco Data Center Network Manager perform administrator-level template actions. The business risk is unauthorized network-management change, data exposure, or deletion inside a DCNM environment. Cisco says updates are available and there are no workarounds.
Executive priority
Treat as a moderate-priority infrastructure management issue. Prioritize remediation where DCNM controls production network templates or where many non-admin users can access the management interface.
Technical view
The issue is improper authorization in DCNM's web-based management interface, mapped to CWE-285. Cisco describes access to administrator-only resources being insufficiently limited, allowing listing, viewing, creating, editing, and deleting templates with administrator-like capability. CVSS v3.1 is 6.3, network reachable, low complexity, privileges required.
Likely exposure
Exposure is limited to organizations running Cisco Data Center Network Manager with authenticated low-privileged users who can reach the web management interface. The bundle does not identify exact affected versions.
Exploitation context
The bundle does not support active exploitation: KEV is false and no cited source claims exploitation in the wild. Cisco describes exploitation as requiring an authenticated attacker and a malicious URL lure.
Researcher notes
Evidence is complete for vulnerability class, impact, and vendor remediation direction, but incomplete for affected version ranges. One bundled Cisco ESA TLS DoS reference appears unrelated to this DCNM authorization bypass.
Mitigation direction
- Apply Cisco software updates for the DCNM advisory.
- Do not rely on workarounds; Cisco states none address this issue.
- Restrict DCNM management interface access to trusted administrative networks.
- Review vendor guidance for exact fixed releases and upgrade paths.
Validation and detection
- Inventory Cisco DCNM deployments and exposed management interfaces.
- Confirm installed DCNM versions against Cisco's advisory.
- Review DCNM template audit logs for unauthorized create, edit, or delete activity.
- Check user roles for unnecessary low-privileged accounts with DCNM access.
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-285: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3539 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
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/RL:X/RC:X/E:X
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:N/S:U/C:L/I:L/A:L/RL:X/RC:X/E:X2.83.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/RL:X/RC:X/E:X
Source materials
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 Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.