The Meeting That Killed the Room: Deep Dive into CVE-2026-20119
Vulnerability ID: CVE-2026-20119
CVSS Score: 7.5
Published: 2026-02-04
A critical Denial of Service (DoS) vulnerability in the text rendering subsystem of Cisco TelePresence and RoomOS devices allows unauthenticated attackers to crash systems remotely. By sending a specifically crafted meeting invitation, an attacker can force the endpoint to reload, disrupting operations and potentially causing persistent outages without requiring any user interaction.
TL;DR
Unauthenticated remote DoS in Cisco RoomOS/CE. Sending a malformed meeting invitation triggers a crash in the text rendering engine. CVSS 7.5. No workarounds; patch immediately.
Technical Details
- CVE ID: CVE-2026-20119
- CVSS v3.1: 7.5 (High)
- CWE: CWE-1287 (Improper Validation)
- Attack Vector: Network (SIP/VoIP)
- Privileges Required: None
- User Interaction: None
- Exploit Status: No Active Exploitation (yet)
Affected Systems
- Cisco RoomOS 10.x
- Cisco RoomOS 11.x
- Cisco TelePresence CE9.x
-
Cisco RoomOS: 11.x < 11.32.2.1 (Fixed in:
11.32.2.1) -
Cisco RoomOS: 10.x < 10.19.5.6 (Fixed in:
10.19.5.6) -
Cisco TelePresence CE: 9.x < 9.15.18.6 (Fixed in:
9.15.18.6)
Exploit Details
- Hypothetical: Exploit involves sending malformed SIP INVITE headers (Subject/From) to the target.
Mitigation Strategies
- Upgrade Firmware
- Network Segmentation (restrict SIP traffic)
Remediation Steps:
- Identify all Cisco TelePresence and RoomOS endpoints in the inventory.
- Verify the current running version against the advisory list (e.g., RoomOS 11.x < 11.32.2.1).
- Schedule a maintenance window (reboot required).
- Apply the latest stable release provided by Cisco (e.g., RoomOS 11.32.2.1).
- Verify device stability post-update.
References
Read the full report for CVE-2026-20119 on our website for more details including interactive diagrams and full exploit analysis.
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