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CVE Record

CVE-2020-3491: Cisco Vision Dynamic Signage Director Stored Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco Vision Dynamic Signage Director could allow an authenticated, remote attacker with administrative privileges to conduct a cross-site scripting (XSS) attack against a user of the interface on an affected device. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by inserting malicious data into a specific data field in the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information. To exploit this vulnerability, the attacker would need to have administrative privileges on the affected device.

MediumCVSS 5.5Not KEV-listedUpdated
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-3491 is a stored cross-site scripting issue in Cisco Vision Dynamic Signage Director. An attacker must already have administrative access, but could plant script content that runs in the management interface and may expose browser-based sensitive information.

Executive priority

Treat as a targeted administrative-console risk, not an emergency internet-wide issue. Prioritize confirmation of exposure, vendor-guided patch planning, and admin access hygiene because successful exploitation could affect confidentiality and integrity inside the management interface.

Technical view

The vulnerability affects the web-based management interface of Cisco Vision Dynamic Signage Director. Improper validation of user-supplied input allows an authenticated remote administrator to insert malicious data into a specific interface field, causing arbitrary script execution in the interface context. CVSS v3.1 is 5.5, CWE-79.

Likely exposure

Exposure is limited to organizations running Cisco Vision Dynamic Signage Director, especially where the management interface is reachable by administrators. The source bundle does not identify affected release ranges or CPEs, so version-specific exposure requires Cisco advisory review.

Exploitation context

The provided sources do not show known active exploitation, and this CVE is not marked KEV. Exploitation requires administrative privileges on the affected device, reducing broad internet-scale risk but increasing concern if admin accounts are shared, compromised, or poorly governed.

Researcher notes

Evidence is limited to the CVE record and Cisco advisory reference. The bundle does not name affected versions, fixed versions, field names, proof-of-concept status, or observed exploitation. Avoid assuming broader Cisco product impact without vendor confirmation.

Mitigation direction

  • Review Cisco advisory for affected releases, fixed software, and any official workarounds.
  • Apply Cisco-provided remediation after confirming the deployed product version is affected.
  • Restrict management interface access to trusted administrative networks where feasible.
  • Review and reduce administrative accounts to the minimum operational requirement.

Validation and detection

  • Inventory Cisco Vision Dynamic Signage Director deployments and management interface locations.
  • Compare installed versions against the Cisco advisory's affected and fixed release guidance.
  • Review administrative account assignments for unnecessary or shared privileged access.
  • Check interface audit logs for unexpected administrator changes or suspicious stored content.
Prepared
Confidence
high
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

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 lookup
cve · low confidence lookup

CVE-2020-3491 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N2.32.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2020-3491Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Vision Dynamic Signage Directorn/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

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.