CVE-2022-20783
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to cause denial of service on Cisco TelePresence and RoomOS devices by sending crafted H.323 traffic. Affected devices may reboot normally or into maintenance mode, disrupting video conferencing services. Organizations using Cisco TelePresence Collaboration Endpoint or RoomOS software are impacted.
💻 Affected Systems
- Cisco TelePresence Collaboration Endpoint (CE) Software
- Cisco RoomOS Software
📦 What is this software?
Roomos by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Critical video conferencing systems become unavailable during important meetings, causing business disruption and communication failures.
Likely Case
Targeted devices reboot unexpectedly, interrupting active video calls and requiring manual intervention to restore service.
If Mitigated
With proper network segmentation and traffic filtering, exploitation attempts are blocked before reaching vulnerable devices.
🎯 Exploit Status
Exploitation requires sending crafted H.323 packets to vulnerable devices. No authentication is required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Cisco Security Advisory for specific fixed versions per device model
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ce-roomos-dos-c65x2Qf2
Restart Required: Yes
Instructions:
1. Review Cisco Security Advisory for affected device models. 2. Download appropriate firmware updates from Cisco Software Center. 3. Apply updates following Cisco's upgrade procedures. 4. Reboot devices after update completion.
🔧 Temporary Workarounds
Disable H.323 Protocol
allDisable H.323 protocol on affected devices if not required for operations
xConfiguration Conference 1 H323 Mode: Off
Network Access Control
allRestrict H.323 traffic to trusted sources using firewall rules
🧯 If You Can't Patch
- Implement strict network segmentation to isolate video conferencing systems from untrusted networks
- Deploy intrusion prevention systems (IPS) to detect and block malicious H.323 traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against affected versions listed in Cisco Security AdvisoryCheck Version:
xStatus SystemUnit Software VersionVerify Fix Applied:
Verify firmware version has been updated to fixed release specified in Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Maintenance mode entries
- H.323 protocol errors
Network Indicators:
- Unusual H.323 traffic patterns
- Multiple H.323 connection attempts from single source
SIEM Query:
source="cisco-telepresence" AND (event_type="reboot" OR event_type="maintenance_mode")