# CVE-2026-20153: Cisco RoomOS improper input validation denial of service

Source: https://junglewise.ai/threats/cve-2026-20153-cisco-roomos-improper-input-validation-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-15. Updated: 2026-07-15  
License: CC BY 4.0 with a link back

CVE-2026-20153 · Severity: high · CVSS 7.5 · Published 2026-07-15

Cisco RoomOS is the operating system used by Cisco collaboration and video conferencing devices. A vulnerability in how the system processes incoming data could allow a remote attacker to cause the device to crash or become unavailable. This would disrupt business meetings and communication services until the device is recovered.

Technologies: [Cisco RoomOS](https://junglewise.ai/threats/technologies/roomos). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2026-20153 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20153 being exploited in the wild.

**How severe is CVE-2026-20153?** High severity, with a CVSS score of 7.5, published 15 July 2026.

**Which products and versions are affected?** Cisco RoomOS 11 and earlier; 26 before 26.5.2.2.

**Is there a fix for CVE-2026-20153?** A patch was published on 2026-07-15. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-20153 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-20153?** Check whether you run Cisco RoomOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Multiple vulnerabilities in Cisco RoomOS are categorized under CWE-20 (Improper Input Validation). The root cause is a failure of the software to properly validate input data, which can be exploited by a remote, unauthenticated attacker via the network. A successful exploit allows the attacker to cause a denial of service (DoS) on the affected device. These vulnerabilities were identified during internal testing, including the use of AI models for security review. Cisco has released RoomOS 11.32.6.0 (on-premises), 11.39.1.1 (cloud), and 26.5.2.2 to address these issues.

## Affected products

- Cisco RoomOS Software 11 and earlier; 26 before 26.5.2.2

## Timeline

- 2026-07-15: disclosed
- 2026-07-15: advisory
- 2026-07-15: patched

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-roomos-AqNMbEq](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-roomos-AqNMbEq)

## Related threats

- [Cisco RoomOS buffer overflow in USB driver](https://junglewise.ai/threats/cve-2026-20302-cisco-roomos-buffer-overflow-in-usb-driver)
- [Cisco RoomOS information disclosure in logging subsystem](https://junglewise.ai/threats/cve-2026-20289-cisco-roomos-information-disclosure-in-logging-subsystem)
- [Cisco RoomOS denial of service in exceptional condition handling](https://junglewise.ai/threats/cve-2026-20187-cisco-roomos-denial-of-service-in-exceptional-condition-handling)
- [Cisco RoomOS improper resource control denial of service](https://junglewise.ai/threats/cve-2026-20158-cisco-roomos-improper-resource-control-denial-of-service)
- [Cisco RoomOS missing encryption for sensitive data](https://junglewise.ai/threats/cve-2026-20157-cisco-roomos-missing-encryption-for-sensitive-data)