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Virtualized Voice BrowserApplication · Cisco

CVE-2021-1575

MEDIUM · 6.1 CVSS v3.1 Published 2021-07-08
Fix available
A fix is available. Upgrade to 12.6 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability in the web-based management interface of Cisco Virtualized Voice Browser could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Cross-site scripting (XSS) vulnerability in Cisco Virtualized Voice Browser web-based management interface due to improper validation of user-supplied input. An unauthenticated remote attacker can exploit this by tricking a user into clicking a crafted link, allowing execution of arbitrary script code in the context of the affected interface or access to sensitive browser-based information.

MitigationApply Cisco's patch for CVE-2021-1575 when available. In the interim, disable the web-based management interface if not required, and educate users about avoiding suspicious links.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Virtualized Voice BrowserApplication
Affected:< 12.6\(1\)

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Cisco Virtualized Voice Browser presence
    Identify whether Cisco Virtualized Voice Browser software is installed in your environment. Check system inventories, installed packages, or contact your infrastructure team to verify the product is in use.
    Affected if The product is installed and the web-based management interface is accessible.
  2. Check installed version against affected range
    Locate and record the installed version of Cisco Virtualized Voice Browser. Common methods include checking the software itself via CLI, reviewing installation documentation, or querying the system where it is deployed.
    Affected if The installed version is any version prior to 12.6(1).
  3. Verify web-based management interface is enabled
    Determine if the web-based management interface for Cisco Virtualized Voice Browser is currently enabled and accessible on the network. Check interface bindings, firewall rules, or management service status.
    Affected if The web-based management interface is enabled and reachable.
  4. Review management interface access controls
    Inspect access control configurations for the web-based management interface, including authentication settings, allowed source IP ranges, and whether the interface is exposed to untrusted networks.
    Affected if The interface is exposed to unauthenticated or untrusted users.

You are affected if Cisco Virtualized Voice Browser with a version prior to 12.6(1) is installed AND its web-based management interface is enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 12.6 or later
Fixed in 12.6
Interim mitigation

Apply Cisco's patch for CVE-2021-1575 when available. In the interim, disable the web-based management interface if not required, and educate users about avoiding suspicious links.

Fix this in Virtualized Voice Browser Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

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dbcve dependency scanner

Check whether your project pulls in CVE-2021-1575 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-1575 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data