Root code execution via USB driver overflow
Published Aug 19, 2026 · Updated Aug 20, 2026
Stack-based buffer overflow in the USB driver in Cisco RoomOS allows physically proximate attackers to execute code as root via a malicious USB device. The driver fails to enforce bounds on specific USB-supplied data, so a crafted device can overrun a stack buffer during driver processing. Exploitation requires physical access to an exposed USB port on an affected endpoint; Cisco states all device configurations are affected and reports no known public exploitation.
Summary
What happened
Stack-based buffer overflow in the USB driver in Cisco RoomOS allows physically proximate attackers to execute code as root via a malicious USB device. The driver fails to enforce bounds on specific USB-supplied data, so a crafted device can overrun a stack buffer during driver processing. Exploitation requires physical access to an exposed USB port on an affected endpoint; Cisco states all device configurations are affected and reports no known public exploitation.
The record
- CVE
- CVE-2026-20302
- Published
- Aug 19, 2026
- Updated
- Aug 20, 2026
- Vendor
- ClamAV
- Product
- Cisco RoomOS
- Classifications
- CWE-120, T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=RoomOS 10.11.2.2
- Affected versionversion=RoomOS 10.11.3.0
- Affected versionversion=RoomOS 10.11.4.1
- Affected versionversion=RoomOS 10.11.5.2
- Affected versionversion=RoomOS 10.11.6.0
- Affected versionversion=RoomOS 10.15.2.2
- Affected versionversion=RoomOS 10.15.3.0
- Affected versionversion=RoomOS 10.15.4.1
- Affected versionversion=RoomOS 10.15.5.3
- Affected versionversion=RoomOS 10.19.2.2
- Affected versionversion=RoomOS 10.19.3.0
- Affected versionversion=RoomOS 10.19.4.2
- Affected versionversion=RoomOS 10.19.5.6
- Affected versionversion=RoomOS 10.19 StepUpg
- Affected versionversion=RoomOS 10.3.2.0
- Affected versionversion=RoomOS 10.3.2.4
- Affected versionversion=RoomOS 10.3.3.0
- Affected versionversion=RoomOS 10.3.4.0
- Affected versionversion=RoomOS 10.8.2.5
- Affected versionversion=RoomOS 10.8.3.1
- Affected versionversion=RoomOS 10.8.4.0
- Affected versionversion=RoomOS 11.1.2.4
- Affected versionversion=RoomOS 11.1.3.1
- Affected versionversion=RoomOS 11.1.4.1
- Affected versionversion=RoomOS 11.14.2.1
- Affected versionversion=RoomOS 11.14.2.3
- Affected versionversion=RoomOS 11.14.3.0
- Affected versionversion=RoomOS 11.14.4.0
- Affected versionversion=RoomOS 11.14.5.0
- Affected versionversion=RoomOS 11.17.2.2
- Affected versionversion=RoomOS 11.17.3.0
- Affected versionversion=RoomOS 11.17.4.0
- Affected versionversion=RoomOS 11.20.2.3
- Affected versionversion=RoomOS 11.20.3.0
- Affected versionversion=RoomOS 11.23.1.6
- Affected versionversion=RoomOS 11.23.1.8
- Affected versionversion=RoomOS 11.24.1.5
- Affected versionversion=RoomOS 11.24.2.4
- Affected versionversion=RoomOS 11.24.3.0
- Affected versionversion=RoomOS 11.24.4.1
- Affected versionversion=RoomOS 11.27.2.0
- Affected versionversion=RoomOS 11.27.3.0
- Affected versionversion=RoomOS 11.27.4.0
- Affected versionversion=RoomOS 11.27.5.0
- Affected versionversion=RoomOS 11.28.1.3
- Affected versionversion=RoomOS 11.31.1.5
- Affected versionversion=RoomOS 11.32.2.1
- Affected versionversion=RoomOS 11.32.3.0
- Affected versionversion=RoomOS 11.32.4.0
- Affected versionversion=RoomOS 11.32.5.1
- Affected versionversion=RoomOS 11.32.6.0
- Affected versionversion=RoomOS 11.33.1.7
- Affected versionversion=RoomOS 11.34.1.2
- Affected versionversion=RoomOS 11.35.1.2
- Affected versionversion=RoomOS 11.36.1.1
- Affected versionversion=RoomOS 11.37.1.0
- Affected versionversion=RoomOS 11.38.1.1
- Affected versionversion=RoomOS 11.39.1.1
- Affected versionversion=RoomOS 11.5.2.4
- Affected versionversion=RoomOS 11.5.3.3
- Affected versionversion=RoomOS 11.5.4.6
- Affected versionversion=RoomOS 11.9.2.4
- Affected versionversion=RoomOS 11.9.3.1
- Affected versionversion=RoomOS 26.0.1.2
- Affected versionversion=RoomOS 26.1.1.5
- Affected versionversion=RoomOS 26.2.2.2
- Affected versionversion=RoomOS 26.3.1.3
- Affected versionversion=RoomOS 26.4.1.4
- Affected versionversion=RoomOS 26.4.1.6
- Affected versionversion=RoomOS 26.5.2.0
- Affected versionversion=RoomOS 26.5.2.2
- Affected versionversion=RoomOS 26.6.1.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo