CISCO Security Advisory
Published Date: Not specified
CVE: CVE-2026-20302
Advisory Summary
🏷️ 🧩 Cisco RoomOS Stack Overflow Vulnerability — Physical Access USB Attack Surface
🚨 ⚠️ Alarm (What happened?)
Cisco disclosed a vulnerability in the USB driver of Cisco RoomOS. An unauthenticated local attacker with physical access to the device’s USB port could exploit insufficient boundary checks and trigger a buffer overflow, leading to arbitrary code execution with root privileges.
- Privilege escalation to root on affected RoomOS devices
- Exploitation requires physical proximity, but many deployments (meeting rooms, kiosks, signage/AV spaces) can make this threat realistic via insider access or unattended hardware scenarios.
🎯 🧨 How attackers would do it
1. Plug in a malicious USB device
2. Deliver crafted input to the USB driver
3. Trigger the stack overflow / memory corruption
4. Execute code as root
- Cisco has released software updates that address the vulnerability.
- No workarounds are available.
- Prioritize patching: Treat as a high-priority remediation for sites where devices may be physically accessible.
- Control physical access: Consider port shielding, disabled/blocked USB usage policies, and stronger physical security around endpoints.
- Inventory & readiness: Identify RoomOS models/versions in scope and schedule updates in the next maintenance window (or sooner if feasible).
- Verify update effectiveness: Confirm post-upgrade version levels match Cisco’s fixed releases.
- CVE: CVE-2026-20302
- Security Impact Rating: Medium
🔗
-2026-20302
Reference: Vendor Advisory