Description

A vulnerability in the USB driver of Cisco RoomOS could allow an unauthenticated, local attacker with physical access to the USB port on an affected device to execute arbitrary code with root privileges. This vulnerability is due to insufficient boundary checks for specific data that is provided through the USB driver. An attacker could exploit this vulnerability by connecting a malicious USB device to an affected device. A successful exploit could allow the attacker to cause a buffer overflow condition on the affected system and execute arbitrary code with root privileges.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.1",
  "pubDate": "2026-08-19T17:18:39.527Z",
  "pubdate": "2026-08-19T17:18:39.527Z",
  "executiveSummary": "A buffer overflow vulnerability exists within the USB driver of Cisco RoomOS, potentially allowing an unauthenticated, local attacker with physical access to execute arbitrary code with root privileges.\nThe vulnerability stems from a lack of proper boundary checks performed on data supplied via connected USB peripherals.\nAn attacker capable of physically interacting with the device can exploit this flaw by connecting a specially crafted malicious USB device to the target system.\nSuccessful exploitation results in memory corruption, specifically a buffer overflow condition, which grants the adversary full administrative control over the underlying operating system.\nBecause the execution occurs with root privileges, the security implications are severe, encompassing total compromise of confidentiality, integrity, and availability of the affected endpoint.\nPrerequisites for a successful attack strictly require physical proximity and direct access to the USB port of an affected Cisco RoomOS device, meaning remote exploitation vectors are not present.",
  "technicalDetails": "The root cause of the vulnerability resides in the USB driver component of Cisco RoomOS, which fails to adequately validate the size and boundaries of incoming data structures provided by connected hardware.\nWhen a peripheral device is attached to the system's physical USB port, the driver processes the incoming data streams without enforcing strict bounds checking on memory buffers allocated to handle the input.\nBy supplying a maliciously crafted data payload via a custom or reprogrammed USB device, an attacker can transmit an input stream that exceeds the predetermined size of the destination memory buffer.\nThis overflow condition overwrites adjacent memory regions, potentially corrupting critical execution context and control data structures within the kernel or driver space.\nUpon successful overwriting of execution pointers, the instruction pointer can be redirected to execute attacker-supplied arbitrary code payloads.\nThe exploitation flow proceeds as follows: First, the attacker gains physical access to the target Cisco RoomOS device. Second, the malicious USB hardware is inserted into the physical port. Third, the unvalidated data triggers the buffer overflow during driver interaction. Finally, the payload executes in the context of the root user.\nAuthentication requirements are nonexistent, as the attack vector does not require system credentials or prior network authentication.\nPrivilege requirements are limited to physical access capabilities required to interface with the hardware port.\nNetwork exposure is zero, as the vulnerability is strictly local and cannot be leveraged remotely over any network protocol.\nThe post-exploitation impact includes complete system compromise, allowing the attacker to execute arbitrary commands, install persistent backdoors, modify system configurations, or manipulate device peripherals with root privileges."
}