CVE-2025-49461
📋 TL;DR
A cross-site scripting vulnerability in certain Zoom Workplace Clients allows unauthenticated attackers to conduct denial of service attacks via network access. This affects users running vulnerable versions of Zoom Workplace Clients who interact with malicious content. The vulnerability enables attackers to disrupt normal client functionality through crafted network requests.
💻 Affected Systems
- Zoom Workplace Client
📦 What is this software?
Rooms by Zoom
Rooms by Zoom
Rooms by Zoom
Rooms by Zoom
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of Zoom Workplace Client functionality for affected users, preventing legitimate use of the application until restarted or patched.
Likely Case
Temporary denial of service affecting individual users' Zoom Workplace Clients, requiring application restart to restore functionality.
If Mitigated
Minimal impact with proper network segmentation and client-side security controls in place.
🎯 Exploit Status
Exploitation requires crafting malicious content that triggers the XSS vulnerability, leading to DoS conditions. No authentication required for initial network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check ZSB-25034 for specific patched versions
Vendor Advisory: https://www.zoom.com/en/trust/security-bulletin/ZSB-25034
Restart Required: Yes
Instructions:
1. Open Zoom Workplace Client. 2. Click your profile picture. 3. Select 'Check for Updates'. 4. Install any available updates. 5. Restart the application.
🔧 Temporary Workarounds
Disable automatic content loading
allConfigure Zoom Workplace to require manual approval for loading external content
Network filtering
allImplement network filtering to block suspicious content delivery to Zoom clients
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Zoom clients from untrusted networks
- Deploy endpoint protection with behavior monitoring to detect DoS attempts
🔍 How to Verify
Check if Vulnerable:
Check Zoom Workplace Client version against affected versions listed in ZSB-25034 advisoryCheck Version:
In Zoom Workplace Client: Click profile picture → About → Check version numberVerify Fix Applied:
Verify Zoom Workplace Client version is updated to patched version specified in ZSB-25034📡 Detection & Monitoring
Log Indicators:
- Zoom client crash logs
- Unexpected termination events
- Error messages related to content parsing
Network Indicators:
- Unusual network requests to Zoom clients
- Patterns of crafted content delivery
SIEM Query:
source="zoom_client" AND (event_type="crash" OR event_type="error") AND message CONTAINS "content"