CyberSecBulletin
CVE-2026-20158NVD status: Undergoing Analysis

Cisco RoomOS Software: Improper Control of a Resource Through its Lifetime

Published Updated By the CyberSecBulletin desk

CVE-2026-20158 is a high-severity improper control of a resource through its lifetime vulnerability in Cisco RoomOS Software from Cisco, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Cisco RoomOS Software versions: RoomOS 10.11.2.2; RoomOS 10.15.2.2; RoomOS 11.5.4.6, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.47% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Roomos to 11.32.6.0 or 26.5.2.2, whichever matches your release line, or a later version.
  2. Update Roomos Cloud to 11.39.1.1 or 26.7.1.7, whichever matches your release line, or a later version.
  3. Read the advisory on sec.cloudapps.cisco.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
CiscoCisco RoomOS SoftwareRoomOS 10.11.2.2; RoomOS 10.15.2.2; RoomOS 11.5.4.6; RoomOS 11.5.2.4; RoomOS 10.8.2.5; RoomOS 10.11.5.2; RoomOS 10.11.3.0; RoomOS 10.15.5.3; and 32 more rangesNot stated
CiscoRoomosbefore 11.32.6.0; 26.0.1.2 up to, but not including, 26.5.2.211.32.6.0, 26.5.2.2
CiscoRoomos Cloudbefore 11.39.1.1; 26.0.1.2 up to, but not including, 26.7.1.711.39.1.1, 26.7.1.7

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (cisco.com).

Official description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco RoomOS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20158 are related to improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Control of a Resource Through its Lifetime

The product does not maintain or incorrectly maintains control over a resource throughout its lifetime of creation, use, and release.

More Improper Control of a Resource Through its Lifetime vulnerabilities (CWE-664)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Cisco RoomOS Software

All Cisco RoomOS Software vulnerabilities

Recent Improper Control of a Resource Through its Lifetime vulnerabilities

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