Cyber Resilience

CVE-2026-20158

Cisco Roomos ≤ 11.32.6.0

Published
15 July 2026
Modified
11 August 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0025 17th percentile
Risk Priority 56 floored blend · peak EPSS

Summary

CVE-2026-20158 is a high-severity Improper Control of a Resource Through its Lifetime (CWE-664) vulnerability in Cisco Roomos. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Process Injection (T1055); ranked at the 17th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-39 (Process Isolation) and SC-4 (Information in Shared System Resources) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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…

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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.

CWE(s)
CWE-664

Related Threats

MITRE ATT&CK Enterprise Techniques

T1055 Process Injection Stealth
Adversaries may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges.
attack.mitre.org →
T1134 Access Token Manipulation Stealth
Adversaries may modify access tokens to operate under a different user or system security context to perform actions and bypass access controls.
attack.mitre.org →
T1134.002 Create Process with Token Stealth
Adversaries may create a new process with an existing token to escalate privileges and bypass access controls.
attack.mitre.org →
T1606 Forge Web Credentials Credential Access
Adversaries may forge credential materials that can be used to gain access to web applications or Internet services.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1134.001 Token Impersonation/Theft Stealth
Adversaries may duplicate then impersonate another user's existing token to escalate privileges and bypass access controls.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-20156Same product: Cisco Roomos
CVE-2026-20187Same product: Cisco Roomos
CVE-2026-20153Same product: Cisco Roomos
CVE-2026-20150Same product: Cisco Roomos
CVE-2026-20157Same product: Cisco Roomos
CVE-2026-20269Same vendor: Cisco
CVE-2023-20093Same product: Cisco Roomos
CVE-2023-20092Same product: Cisco Roomos
CVE-2023-20094Same product: Cisco Roomos
CVE-2023-20090Same product: Cisco Roomos

Affected Assets

cisco
roomos
≤ 11.32.6.0 · 26.0.1.2 — 26.5.2.2
cisco
roomos cloud
≤ 11.39.1.1 · 26.0.1.2 — 26.7.1.7

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 4 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SC-39 Process Isolation partial match

SC-39 enforces separate execution domains so one process cannot corrupt or misuse another process's resources across their lifetimes.

SC-4 Information in Shared System Resources partial match

SC-4 prevents unintended information transfer through shared resources, limiting blast radius when a product fails to release or reuse resources correctly.

SI-16 Memory Protection partial match

SI-16 blocks unauthorized code execution in memory, stopping exploitation that commonly follows improper allocation, use-after-free, or deallocation errors.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

ID.AM-08 full match
prevents

Directly requires managing assets through creation, use, and disposal phases, preventing lifetime control failures.

PR.PS-01 mostly match
prevents

Enforces consistent configuration and handling rules that reduce improper resource lifetime management.

PR.PS-06 mostly match
prevents

Integrates secure practices across the full development lifecycle, addressing resource creation-to-release control.

PR.PS-02 partial match
prevents

Covers ongoing maintenance and removal of software, indirectly limiting resource lifetime issues.

PR.PS-03 partial match
prevents

Addresses hardware maintenance and replacement phases that intersect with resource lifetime control.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.10 Information deletion partial match
prevents

Information deletion control ensures proper release and sanitization at end of life.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC embeds resource lifecycle controls from design through decommissioning.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce lifetime control issues but are not specific to them.

A.8.28 Secure coding partial match
prevents

Secure coding practices help avoid lifetime control bugs but do not address the full scope.

A.8.9 Configuration management partial match
degrades

Configuration management enforces lifecycle rules for resource creation, use and disposal.

A.8.13 Information backup none match
none

Backups preserve resources but do not govern their full lifetime control.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Windows Server 2016 (2 rules)
  • V-224971 The Active Directory SYSVOL directory must have the proper access control permissions. prevents CWE-664
  • V-224970 Permissions on the Active Directory data files must only allow System and Administrators access. prevents CWE-664
Windows Server 2019 (1 rule)
  • V-205739 Windows Server 2019 permissions on the Active Directory data files must only allow System and Administrators access. prevents CWE-664

References