CVE-2026-20119
📋 TL;DR
An unauthenticated remote attacker can cause Cisco TelePresence and RoomOS devices to reload by sending crafted text, resulting in denial of service. This affects Cisco collaboration endpoints running vulnerable software versions. No user interaction is required for exploitation.
💻 Affected Systems
- Cisco TelePresence Collaboration Endpoint (CE) Software
- Cisco RoomOS Software
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Continuous DoS attacks rendering devices unusable, disrupting meetings and collaboration services
Likely Case
Intermittent device reloads causing meeting disruptions and service interruptions
If Mitigated
Minimal impact with proper network segmentation and monitoring
🎯 Exploit Status
Exploitation requires sending crafted text to vulnerable devices, no authentication needed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tce-roomos-dos-9V9jrC2q
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions 2. Download and apply appropriate firmware update 3. Reboot affected devices 4. Verify update successful
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to collaboration endpoints from untrusted networks
Input Validation
allImplement external filtering of meeting invitations and text inputs
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict access controls
- Monitor for abnormal device reloads and implement rate limiting on text inputs
🔍 How to Verify
Check if Vulnerable:
Check device software version against Cisco advisory affected versions listCheck Version:
Check device web interface or CLI for software version (varies by model)Verify Fix Applied:
Verify device is running patched version from Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected device reloads
- Multiple failed rendering attempts
- Abnormal meeting invitation processing
Network Indicators:
- Unusual traffic patterns to collaboration endpoints
- Multiple connection attempts with crafted text
SIEM Query:
search 'device_reload' OR 'crash' AND source='cisco_collaboration'