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Webex MeetingsApplication · Cisco

CVE-2020-3263

HIGH · 7.5 CVSS v3.1 Published 2020-06-18
Fix available
A fix is available. Upgrade to 39.5.12 or later.
See remediation →
82/100
Remediation priority · High
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 Meetings Desktop App could allow an unauthenticated, remote attacker to execute programs on an affected end-user system. The vulnerability is due to improper validation of input that is supplied to application URLs. The attacker could exploit this vulnerability by persuading a user to follow a malicious URL. A successful exploit could allow the attacker to cause the application to execute other programs that are already present on the end-user system. If malicious files are planted on the system or on an accessible network file path, the attacker could execute arbitrary code on the affected system.

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

A vulnerability in Cisco Webex Meetings Desktop App allows unauthenticated remote attackers to execute local programs on end-user systems by persuading users to follow malicious URLs. The root cause is improper validation of input supplied to application URLs, which can lead to arbitrary code execution if malicious files exist on the system or accessible network paths.

MitigationApply the vendor patch from Cisco to update vulnerable Webex Desktop App installations, and educate users to avoid clicking untrusted URLs.

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
Webex MeetingsApplication
Affected:< 39.5.12

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
High
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

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. Locate Cisco Webex Meetings Desktop App executable
    Navigate to the Webex installation directory. On Windows, typical paths are C:\Program Files\Webex\Webex\Applications\Webex.exe or C:\Users\[User]\AppData\Local\Webex\. On Mac, check /Applications/Webex.app. Right-click the executable and select Properties, then view the Details tab to find the Product Version.
    Affected if The Product Version field shows a version number lower than 39.5.12, or if the file properties cannot be read and the application cannot be identified.
  2. Check version via Windows registry
    Open Registry Editor and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebexMeetingsApp or HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebexMeetingsApp. Locate the DisplayVersion value.
    Affected if The DisplayVersion value is less than 39.5.12 (for example, 39.5.11, 39.5.10, etc.).
  3. Verify via Webex application help menu
    Open the Cisco Webex Meetings Desktop App, click the gear icon or menu labeled with your username, select Help, then About Webex Meetings. The version number displays in the dialog that opens.
    Affected if The displayed version is below 39.5.12.
  4. Check for Webex URL protocol handler
    Open Command Prompt and run reg query "HKEY_CLASSES_ROOT\webex" or reg query "HKEY_CURRENT_USER\SOFTWARE\Classes\webex" to see if the webex: protocol handler is registered. Also check HKEY_CLASSES_ROOT\wbx.
    Affected if The webex or wbx URL protocol handler exists on the system, indicating the vulnerable URL-handling component is present.
  5. Confirm application is actively used or installed
    Check if the Webex Meetings Desktop App service or process is present by opening Task Manager, looking for processes named webex.exe, webexm.exe, or ptoneclk.exe under the Cisco Webex folder.
    Affected if The Webex application or its related processes are found running on the system and the version cannot be determined or is below 39.5.12.

The system is affected if Cisco Webex Meetings Desktop App is installed with a version number less than 39.5.12, as the improper input validation vulnerability in URL handling can be exploited through malicious URLs.

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 39.5.12 or later
Fixed in 39.5.12
Interim mitigation

Apply the vendor patch from Cisco to update vulnerable Webex Desktop App installations, and educate users to avoid clicking untrusted URLs.

Fix this in Webex Meetings Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.

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-2020-3263 in production — separate from our analysis above.

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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