CVE-2026-20302: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco RoomOS Software
Description
CVE-2026-20302 is a buffer overflow vulnerability in the USB driver of Cisco RoomOS software. It allows an unauthenticated local attacker with physical access to the USB port to execute arbitrary code with root privileges by connecting a malicious USB device. The flaw arises from insufficient boundary checks on data provided through the USB driver.
CVSS v3.1
Score 6.1medium
Affected software
Cisco
Cisco RoomOS Software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Cisco RoomOS software's USB driver involves a classic buffer overflow caused by inadequate size checks on input data. An attacker with physical access can exploit this by connecting a malicious USB device, triggering a buffer overflow that enables arbitrary code execution with root privileges. The CVSS 3.1 score is 6.1 (medium severity), reflecting the requirement for physical access and lack of user interaction.
Potential Impact
Successful exploitation allows an unauthenticated local attacker with physical USB port access to execute arbitrary code with root privileges on the affected device. This compromises confidentiality and integrity but does not impact availability according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict physical access to USB ports on affected devices to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.408Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a85d85eacd9273b49511c79
Added to database: 08/19/2026, 16:22:54 UTC
Last enriched: 09/11/2026, 08:04:28 UTC
Last updated: 10/04/2026, 10:02:26 UTC
Views: 61
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