Security readout for executives and security teams
Plain-English summary
Cisco Vision Dynamic Signage Director has a reflected XSS issue in its web management interface. An attacker does not need an account, but must convince an interface user to open a crafted link. Successful exploitation could run script in that user’s browser context and expose browser-based information.
Executive priority
Treat as a moderate-priority management-plane issue. It is not described as wormable or actively exploited, but successful abuse could compromise browser-context data or actions for users of the management interface.
Technical view
CVE-2021-34742 is CWE-79 caused by insufficient validation of user-supplied input in the Cisco Vision Dynamic Signage Director web-based management interface. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to organizations using Cisco Vision Dynamic Signage Director, especially where the management interface is reachable by administrators or operators who could be targeted with malicious links. The source bundle does not provide affected version details.
Exploitation context
The provided sources describe a click-through reflected XSS scenario. There is no KEV listing in the bundle and no cited evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
The key constraints are UI:R and reflected XSS impact. Validate exposure through asset inventory and version comparison, not live payload testing against users. The source bundle lacks affected version and fixed release details beyond the Cisco advisory reference.
Mitigation direction
- Review Cisco’s advisory for affected releases and fixed software guidance.
- Inventory Cisco Vision Dynamic Signage Director deployments and management interface exposure.
- Prioritize remediation for internet-reachable or broadly accessible management interfaces.
- Limit management interface access while vendor guidance is confirmed.
- Educate interface users to avoid unsolicited links targeting management consoles.
Validation and detection
- Confirm whether Cisco Vision Dynamic Signage Director is deployed.
- Identify who can access the web-based management interface.
- Compare deployed versions against Cisco’s advisory guidance.
- Review whether management access is restricted to trusted networks.
- Check security records for suspicious links sent to interface users.
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
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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-2021-34742 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20211006 Cisco Vision Dynamic Signage Director Reflected 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.