CVE-2021-1575Network attack vector

Unauthenticated XSS via unvalidated interface input

Published Jul 8, 2021 · Updated Nov 7, 2024

Cross-site scripting in Cisco Virtualized Voice Browser before 12.6(1) allows remote attackers to execute script in a user's browser via crafted links. The web-based management interface fails to properly validate user-supplied input, allowing injected script to run in the interface context. Exploitation requires an unauthenticated attacker to persuade a management-interface user to click the link, which can expose browser-based information or modify actions available to that user.

CVSS severity6.1
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Cisco Virtualized Voice Browser before 12.6(1) allows remote attackers to execute script in a user's browser via crafted links. The web-based management interface fails to properly validate user-supplied input, allowing injected script to run in the interface context. Exploitation requires an unauthenticated attacker to persuade a management-interface user to click the link, which can expose browser-based information or modify actions available to that user.

The record

CVE
CVE-2021-1575
Published
Jul 8, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Virtualized Voice Browser
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 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 Virtualized Voice Browserversion=n/a

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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