Critical Cisco Webex Vulnerability (CVE-2025-20236)
Velocity Solutions alerts all clients to a critical Cisco Webex vulnerability (CVE-2025-20236). Cisco has recently published an update. These updates address a significant vulnerability that could potentially impact your systems and data security.
Critical Cisco Webex Vulnerability (CVE-2025-20236) Details
Cisco has disclosed a client-side remote code execution vulnerability in the Cisco Webex App’s custom URL parser (CVE-2025-20236). This high-severity vulnerability has a CVSS base score of 8.8 and could allow an unauthenticated, remote attacker to execute arbitrary commands on a user’s system.
How the Vulnerability Works
This vulnerability is due to insufficient input validation when Cisco Webex App processes a meeting invite link. An attacker could exploit this vulnerability by:
- Persuading a user to click a crafted meeting invite link
- Tricking the user into downloading arbitrary files
- Executing arbitrary commands with the privileges of the targeted user
Products Affected
This vulnerability affects Cisco Webex App across all platforms, regardless of system configuration or operating system.
Affected Versions:
- Cisco Webex App 44.6 (versions prior to 44.6.2.30589)
- Cisco Webex App 44.7 (all versions)
Versions Not Vulnerable:
- Cisco Webex App 44.5 and earlier
- Cisco Webex App 44.8 and later
Recommended Actions
The Velocity Solutions security team strongly recommends that all clients using Cisco Webex App take the following actions immediately:
- Identify affected systems in your environment that are running vulnerable versions of Cisco Webex App
- Review the full Cisco security advisory for specific details on the vulnerability and patching requirements
- Schedule immediate updates within your change management process
- Apply the necessary patches as soon as possible to mitigate potential security risks
- Document all remediation activities for compliance and security audit purposes
Patching Information
Cisco has released free software updates that address this vulnerability. Organizations should update to the following versions:
- For Cisco Webex App 44.6: Update to version 44.6.2.30589 or later
- For Cisco Webex App 44.7: Migrate to a fixed release
- Alternatively, upgrade to Cisco Webex App 44.8 or later
Why This Matters
Security vulnerabilities in collaboration tools like Cisco Webex App can potentially expose organizations to:
- Unauthorized access to systems and data
- Data exfiltration or corruption
- Disruption of critical business services
- Potential regulatory compliance issues
- Increased risk of broader network compromise
How Velocity Solutions Can Help
Our team is available to assist clients with:
- Assessing which systems in your environment may be affected
- Planning and executing the update process
- Implementing temporary mitigation measures if immediate patching isn’t possible
- Verifying successful remediation
- Documenting compliance with security requirements
Additional Resources
For detailed information about this vulnerability, please visit Cisco Security Advisories and Notices
Contact Information
If you need assistance addressing this vulnerability or have questions about potential environmental impacts, please contact the Velocity Solutions Security Team.
This security advisory is based on information published by Cisco Technologies (Reference: cisco-sa-webex-app-client-rce-ufyMMYLC). Velocity Solutions will provide updates as additional information becomes available.
