# CVE-2026-20187: Cisco RoomOS denial of service in exceptional condition handling

Source: https://junglewise.ai/threats/cve-2026-20187-cisco-roomos-denial-of-service-in-exceptional-condition-handling  
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-2026-20187 · Severity: high · CVSS 7.5 · Published 2026-07-15

Cisco RoomOS, the operating system for Cisco collaboration and video conferencing devices, is affected by a vulnerability that could allow a remote attacker to cause a service disruption. By sending specific traffic that the system fails to handle correctly, an attacker could cause the device to crash or become unresponsive. This impact is limited to the availability of the device and does not involve the theft of sensitive data or unauthorized access to the system.

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

## Quick answers

**Is CVE-2026-20187 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20187 being exploited in the wild.

**How severe is CVE-2026-20187?** 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-2026-20187?** 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-2026-20187 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-20187?** 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

A vulnerability in Cisco RoomOS software stems from improper handling of exceptional conditions, categorized under CWE-703 (which includes issues like uncaught exceptions or reachable assertions). A remote, unauthenticated attacker could exploit this by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to cause a denial-of-service (DoS) condition, leading to a device crash or reload. This vulnerability was discovered during internal security reviews and software hardening efforts. Cisco has released updates to address this issue; no workarounds are available.

## 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 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)
- [Cisco RoomOS memory buffer vulnerabilities](https://junglewise.ai/threats/cve-2026-20156-cisco-roomos-memory-buffer-vulnerabilities)