# CVE-2026-20158: Cisco RoomOS improper resource control denial of service

Source: https://junglewise.ai/threats/cve-2026-20158-cisco-roomos-improper-resource-control-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-2026-20158 · Severity: high · CVSS 7.5 · Published 2026-07-15

Cisco RoomOS, the operating system for Cisco collaboration and video conferencing devices, is affected by resource management vulnerabilities. An attacker could exploit these issues to cause a denial of service, potentially disrupting business meetings and communication services. Cisco has released software updates to address these issues, which were discovered during internal security reviews.

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

## Quick answers

**Is CVE-2026-20158 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20158 being exploited in the wild.

**How severe is CVE-2026-20158?** 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; 26.5.2.2.

**Is there a fix for CVE-2026-20158?** 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-2026-20158 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-20158?** 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

Cisco RoomOS contains vulnerabilities related to improper control of a resource through its lifetime (CWE-664), including issues such as uninitialized variables and null pointer dereferences. These vulnerabilities were identified during an internal security hardening review. According to the CVSS vector (AV:N/AC:L/PR:N/UI:N), the most impactful of these issues can be exploited remotely over the network without authentication or user interaction, resulting in a high impact on availability (denial of service). Cisco has released RoomOS 11.32.6.0, 11.39.1.1, and June 2026 (26.7.1.7) to remediate these issues.

## Affected products

- Cisco RoomOS Software 11 and earlier; 26; 26.5.2.2

## Timeline

- 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 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)