Cisco RoomOS Stack Overflow Vulnerability

mediumCVE-2026-20302

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-roomos-bof-vTMANZgu Security Impact Rating: Medium CVE: CVE-2026-20302

CSIRTS triage

vendor: Cisco product: RoomOS Memory corruption

What: Stack overflow in the USB driver allows unauthenticated local attackers with physical USB access to execute arbitrary code with root privileges.
Who is affected: Cisco RoomOS devices with accessible USB ports are affected.
Urgency: Medium urgency; requires physical access to USB port, limiting exposure scope.
Action: Apply Cisco RoomOS software updates addressing CVE-2026-20302.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Cisco Security Advisories (INTL · vendor-psirt · site)
Severity: medium
Published: 2026-08-19
Exploitation: Not in CISA KEV at last sync

Original advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-roomos-bof-vTMANZgu?vs_f=Cisco%20Security%20Advisory%26vs_cat=Security%20Intelligence%26vs_type=RSS%26vs_p=Cisco%20RoomOS%20Stack%20Overflow%20Vulnerability%26vs_k=1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-203020.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-20302	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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