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Collaboration Meeting RoomsApplication · Cisco

CVE-2021-40115

MEDIUM · 6.1 CVSS v3.1 Published 2021-11-04
Fix available
A fix is available. Upgrade to 2021.10.18.2439m 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 Cisco Webex Video Mesh could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the 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

This is a stored or reflected XSS vulnerability in Cisco Webex Video Mesh's web-based management interface. The vulnerability exists because the application does not properly validate or sanitize user-supplied input before reflecting it back in web pages. An attacker can craft a malicious URL containing JavaScript code that, when clicked by an authenticated user, executes in the context of that user's session, potentially stealing session cookies or performing actions on behalf of the user.

MitigationApply the vendor patch from Cisco immediately. Until patched, users should be warned not to click untrusted links and consider enabling browser XSS protections.

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
Collaboration Meeting RoomsApplication
Affected:= 2.0
Webex Video MeshApplication
Affected:< 2021.10.18.2439m

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. Identify the installed product
    Access the web-based management interface or use the system CLI to determine if Cisco Webex Video Mesh or Cisco Collaboration Meeting Rooms software is running. Look for product identification in the admin console or system information page.
    Affected if The product is either Cisco Webex Video Mesh or Cisco Collaboration Meeting Rooms.
  2. Determine the installed version number
    In the management interface, navigate to Help > About or Settings > System Info to find the exact software version. From CLI, run the command to display the current version (typically 'show version' or similar).
    Affected if The exact version number cannot be determined or the version falls within the affected ranges.
  3. Compare version against affected ranges
    Check if the installed version is Cisco Collaboration Meeting Rooms exactly version 2.0, OR Cisco Webex Video Mesh with a build date earlier than 2021.10.18.2439m.
    Affected if The version is 2.0 for Cisco Collaboration Meeting Rooms OR the Cisco Webex Video Mesh version is earlier than 2021.10.18.2439m.
  4. Verify management interface is accessible
    Confirm the web-based management interface is enabled and reachable. Attempt to access the admin login page via the configured IP or hostname on the management port.
    Affected if The management interface is accessible without additional authentication barriers beyond user credentials.

If the installed product is Cisco Webex Video Mesh below version 2021.10.18.2439m or Cisco Collaboration Meeting Rooms version 2.0, and the web-based management interface is accessible, the environment is affected by this XSS vulnerability.

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.

dbcve · scoped
Upgrade available Upgrade to 2021.10.18.2439m or later
Fixed in 2021.10.18.2439m
Interim mitigation

Apply the vendor patch from Cisco immediately. Until patched, users should be warned not to click untrusted links and consider enabling browser XSS protections.

Recommended fix High confidence

2021.10.18.2439m or later

  1. 1. Identify the current version of Cisco Webex Video Mesh by accessing the web-based management interface
  2. 2. Navigate to the administration or settings section to view the software version
  3. 3. If the version is earlier than 2021.10.18.2439m, obtain the upgrade package from Cisco (via Cisco.com or official support channels)
  4. 4. Follow Cisco's standard upgrade procedure for Webex Video Mesh, typically via the web interface or CLI
  5. 5. After upgrade, verify the new version is 2021.10.18.2439m or later
  6. 6. Clear browser cache to ensure no cached vulnerable code remains

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Collaboration Meeting Rooms Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

Scan for this in your stack

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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-2021-40115 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