CVE Intelligence
Medium Memory corruption

CVE-2026-20302 — Cisco RoomOS Stack Overflow Vulnerability

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.

Published Aug 19, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: cisco

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
—
No EPSS score.
Affects
Cisco
Cisco RoomOS Software
CVSS base
6.1
Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Cisco Cisco RoomOS Software).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Cisco Cisco RoomOS Software version RoomOS 11.27.2.0version RoomOS 11.34.1.2version RoomOS 26.0.1.2version RoomOS 11.33.1.7version RoomOS 11.32.2.1version RoomOS 11.27.4.0version RoomOS 11.31.1.5version RoomOS 11.27.3.0
and 64 more version RoomOS 11.28.1.3version RoomOS 11.32.3.0version RoomOS 11.24.4.1version RoomOS 11.24.3.0version RoomOS 11.24.2.4version RoomOS 11.24.1.5version RoomOS 11.23.1.8version RoomOS 11.23.1.6version RoomOS 11.20.3.0version RoomOS 11.17.4.0version RoomOS 26.3.1.3version RoomOS 11.39.1.1version RoomOS 11.32.6.0version RoomOS 11.38.1.1version RoomOS 26.6.1.4version RoomOS 26.5.2.2version RoomOS 26.5.2.0version RoomOS 11.37.1.0version RoomOS 11.36.1.1version RoomOS 11.14.5.0version RoomOS 26.4.1.4version RoomOS 26.4.1.6version RoomOS 11.32.5.1version RoomOS 26.2.2.2version RoomOS 11.35.1.2version RoomOS 26.1.1.5version RoomOS 11.32.4.0version RoomOS 11.27.5.0version RoomOS 11.1.3.1version RoomOS 11.14.2.3version RoomOS 11.1.4.1version RoomOS 10.15.3.0version RoomOS 10.3.4.0version RoomOS 10.3.2.4version RoomOS 10.19.4.2version RoomOS 10.19.3.0version RoomOS 10.11.6.0version RoomOS 11.1.2.4version RoomOS 10.19.2.2version RoomOS 10.15.5.3version RoomOS 10.11.3.0version RoomOS 10.11.5.2version RoomOS 10.8.2.5version RoomOS 11.5.2.4version RoomOS 11.5.4.6version RoomOS 10.15.2.2version RoomOS 11.5.3.3version RoomOS 11.20.2.3version RoomOS 11.17.3.0version RoomOS 10.19 StepUpgversion RoomOS 11.14.4.0version RoomOS 11.17.2.2version RoomOS 11.14.3.0version RoomOS 11.9.2.4version RoomOS 10.3.2.0version RoomOS 10.11.2.2version RoomOS 11.9.3.1version RoomOS 10.11.4.1version RoomOS 10.19.5.6version RoomOS 10.15.4.1version RoomOS 10.8.4.0version RoomOS 10.3.3.0version RoomOS 11.14.2.1version RoomOS 10.8.3.1
Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Physical
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.1 CVSS 3.1 Medium 0.9 5.2 psirt@cisco.com via NIST National Vulnerability Database
6.1 CVSS 3.1 Medium — — cisco via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-120 · Classic Buffer Overflow

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · cisco/cisco roomos software
    Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 15, 2026
  • CVSS changed · 6.1
    Oct 15, 2026 · NIST National Vulnerability Database
  • Source status changed · → Awaiting Analysis
    Oct 15, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 15, 2026 · NIST National Vulnerability Database
  • CVE published
    Aug 19, 2026 · cisco

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

Elsewhere on this site

Cisco
every CVE for this vendor
Memory corruption
same class
CWE-120
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-20289 Cisco RoomOS Logging Subsystem Information Disclosure Vulnerability Aug 5, 2026
  • CVE-2026-20150 Cisco RoomOS Security Hardening Release - Access Control Vulnerabilities Jul 15, 2026
  • CVE-2026-20153 Cisco RoomOS Security Hardening Release - Input Validation Vulnerabilities Jul 15, 2026
  • CVE-2026-20156 Cisco RoomOS Security Hardening Release - Buffer Management Vulnerabilities Jul 15, 2026
  • CVE-2026-20157 Cisco RoomOS Security Hardening Release - Missing Encryption Vulnerabilities Jul 15, 2026
  • CVE-2026-20158 Cisco RoomOS Security Hardening Release - Resource Lifetime Management Vulnerabilities Jul 15, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No FIRST EPSS score.
  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20302 is "Cisco RoomOS Stack Overflow Vulnerability", rated Medium. It affects Cisco RoomOS Software (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.1 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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