Security readout for executives and security teams
Plain-English summary
Cisco Data Center Network Manager’s web interface could let a logged-in remote attacker trick an interface user into opening a malicious link. If successful, the attacker could run script in that user’s browser session or read browser-held sensitive information.
Executive priority
Treat this as a moderate-priority management-plane issue. It is not listed as actively exploited in the supplied evidence, but DCNM can be operationally sensitive, and browser-session compromise of administrators could support broader network-management risk.
Technical view
CVE-2020-3518 is a CWE-79 reflected cross-site scripting issue in Cisco DCNM’s web-based management interface. The reported cause is improper validation of user-supplied input. CVSS 3.1 is 6.5 with network attack vector, low complexity, low privileges required, user interaction required, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to organizations running Cisco Data Center Network Manager with users accessing its web management interface. The source bundle does not identify affected DCNM versions, so version-specific exposure requires checking Cisco’s advisory and local asset inventory.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires an authenticated remote attacker and a separate interface user clicking a crafted link, reducing urgency compared with unauthenticated remote code execution but still relevant for privileged management consoles.
Researcher notes
Focus validation on Cisco DCNM web-interface exposure, authenticated access paths, and user roles. The source bundle confirms XSS mechanics and CVSS details but does not provide affected version ranges, fixed versions, proof-of-concept details, or evidence of exploitation.
Mitigation direction
- Check Cisco’s advisory for affected and fixed DCNM releases.
- Apply Cisco-provided updates or workarounds where applicable.
- Limit DCNM management interface access to trusted administrative networks.
- Review privileged DCNM accounts and remove unnecessary access.
- Educate administrators to avoid untrusted management-console links.
Validation and detection
- Inventory Cisco DCNM deployments and record exact software versions.
- Compare installed versions against Cisco’s advisory guidance.
- Confirm DCNM web access is restricted to approved administrators.
- Review whether DCNM users have unnecessary privileges.
- Check security monitoring for suspicious DCNM web-interface activity.
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-2020-3518 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.