Unauthenticated service interruption via resource lifetime errors
Published Jul 15, 2026 · Updated Jul 15, 2026
Resource lifetime flaws in Cisco RoomOS allow remote attackers to interrupt service over a network without authentication. Cisco has not disclosed the affected components or how the grouped uninitialized-variable, null-pointer, and resource-lifecycle errors mishandle network input. The flaws affect devices regardless of configuration, and the published impact is limited to service availability rather than data disclosure or modification.
Summary
What happened
Resource lifetime flaws in Cisco RoomOS allow remote attackers to interrupt service over a network without authentication. Cisco has not disclosed the affected components or how the grouped uninitialized-variable, null-pointer, and resource-lifecycle errors mishandle network input. The flaws affect devices regardless of configuration, and the published impact is limited to service availability rather than data disclosure or modification.
The record
- CVE
- CVE-2026-20158
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- ClamAV
- Product
- Cisco RoomOS
- Classifications
- CWE-664, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 15, 2026CVE publishedPublication date reported by the CVE source.
- Jul 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=RoomOS 10.11.2.2
- Affected versionversion=RoomOS 10.11.3.0
- Affected versionversion=RoomOS 10.11.4.1
- Affected versionversion=RoomOS 10.11.5.2
- Affected versionversion=RoomOS 10.11.6.0
- Affected versionversion=RoomOS 10.15.2.2
- Affected versionversion=RoomOS 10.15.3.0
- Affected versionversion=RoomOS 10.15.4.1
- Affected versionversion=RoomOS 10.15.5.3
- Affected versionversion=RoomOS 10.19.2.2
- Affected versionversion=RoomOS 10.19.3.0
- Affected versionversion=RoomOS 10.19.4.2
- Affected versionversion=RoomOS 10.19.5.6
- Affected versionversion=RoomOS 10.19 StepUpg
- Affected versionversion=RoomOS 10.3.2.0
- Affected versionversion=RoomOS 10.3.2.4
- Affected versionversion=RoomOS 10.3.3.0
- Affected versionversion=RoomOS 10.3.4.0
- Affected versionversion=RoomOS 10.8.2.5
- Affected versionversion=RoomOS 10.8.3.1
- Affected versionversion=RoomOS 10.8.4.0
- Affected versionversion=RoomOS 11.1.2.4
- Affected versionversion=RoomOS 11.1.3.1
- Affected versionversion=RoomOS 11.1.4.1
- Affected versionversion=RoomOS 11.14.2.1
- Affected versionversion=RoomOS 11.14.2.3
- Affected versionversion=RoomOS 11.14.3.0
- Affected versionversion=RoomOS 11.14.4.0
- Affected versionversion=RoomOS 11.14.5.0
- Affected versionversion=RoomOS 11.17.2.2
- Affected versionversion=RoomOS 11.17.3.0
- Affected versionversion=RoomOS 11.17.4.0
- Affected versionversion=RoomOS 11.20.2.3
- Affected versionversion=RoomOS 11.20.3.0
- Affected versionversion=RoomOS 11.23.1.6
- Affected versionversion=RoomOS 11.23.1.8
- Affected versionversion=RoomOS 11.24.1.5
- Affected versionversion=RoomOS 11.24.2.4
- Affected versionversion=RoomOS 11.24.3.0
- Affected versionversion=RoomOS 11.24.4.1
- Affected versionversion=RoomOS 11.27.2.0
- Affected versionversion=RoomOS 11.27.3.0
- Affected versionversion=RoomOS 11.27.4.0
- Affected versionversion=RoomOS 11.27.5.0
- Affected versionversion=RoomOS 11.28.1.3
- Affected versionversion=RoomOS 11.31.1.5
- Affected versionversion=RoomOS 11.32.2.1
- Affected versionversion=RoomOS 11.32.3.0
- Affected versionversion=RoomOS 11.32.4.0
- Affected versionversion=RoomOS 11.32.5.1
- Affected versionversion=RoomOS 11.33.1.7
- Affected versionversion=RoomOS 11.34.1.2
- Affected versionversion=RoomOS 11.35.1.2
- Affected versionversion=RoomOS 11.36.1.1
- Affected versionversion=RoomOS 11.37.1.0
- Affected versionversion=RoomOS 11.38.1.1
- Affected versionversion=RoomOS 11.5.2.4
- Affected versionversion=RoomOS 11.5.3.3
- Affected versionversion=RoomOS 11.5.4.6
- Affected versionversion=RoomOS 11.9.2.4
- Affected versionversion=RoomOS 11.9.3.1
- Affected versionversion=RoomOS 26.0.1.2
- Affected versionversion=RoomOS 26.1.1.5
- Affected versionversion=RoomOS 26.2.2.2
- Affected versionversion=RoomOS 26.3.1.3
- Affected versionversion=RoomOS 26.4.1.4
- Affected versionversion=RoomOS 26.4.1.6
- Affected versionversion=RoomOS 26.5.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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