CVE-2021-34742Network attack vector

Browser script execution via reflected management-interface input

Published Oct 6, 2021 · Updated Nov 7, 2024

Reflected XSS in Cisco Vision Dynamic Signage Director 6.4 and earlier allows remote attackers to run scripts through a crafted link. The web-based management interface reflects insufficiently validated user-supplied input into a page, enabling browser execution. Exploitation requires a user of the interface to click the link; successful code runs in that interface context and can access sensitive browser-based information.

CVSS severity6.1
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Cisco Vision Dynamic Signage Director 6.4 and earlier allows remote attackers to run scripts through a crafted link. The web-based management interface reflects insufficiently validated user-supplied input into a page, enabling browser execution. Exploitation requires a user of the interface to click the link; successful code runs in that interface context and can access sensitive browser-based information.

The record

CVE
CVE-2021-34742
Published
Oct 6, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Vision Dynamic Signage Director
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Vision Dynamic Signage Directorversion=n/a

Published CVSS scores

4.3NISTAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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