Unauthenticated memory corruption via undisclosed processing
Published Jul 15, 2026 · Updated Jul 15, 2026
Memory-buffer errors in affected Cisco RoomOS releases allow remote attackers to corrupt memory through unauthenticated network input. Cisco groups multiple buffer overflows and out-of-bounds writes under this identifier but does not disclose the affected components or the operations performed on untrusted data. Exploitation requires no authentication or user interaction, has high attack complexity, and applies regardless of device configuration; the precise resulting behavior is undisclosed.
Summary
What happened
Memory-buffer errors in affected Cisco RoomOS releases allow remote attackers to corrupt memory through unauthenticated network input. Cisco groups multiple buffer overflows and out-of-bounds writes under this identifier but does not disclose the affected components or the operations performed on untrusted data. Exploitation requires no authentication or user interaction, has high attack complexity, and applies regardless of device configuration; the precise resulting behavior is undisclosed.
The record
- CVE
- CVE-2026-20156
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- ClamAV
- Product
- Cisco RoomOS
- Classifications
- CWE-119
- 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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