CVE-2026-16812
Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability
Arista VeloCloud Orchestrator
VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality and impact the VCO host. Successful exploitation may compromise the confidentiality, integrity, and availability of the orchestrator and data managed by the orchestrator. This functionality was intended to be for internal use only and is not intended to be remotely accessible. Hosted and Dedicated versions of VCO have already been patched in advance of this notice going out. This issue was discovered externally and is known to be actively exploited.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 27 July 2026. US federal agencies were required to remediate it by 30 July 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 1.8%, which is higher than 78.2% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Frequently asked questions
Is CVE-2026-16812 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-16812.
What does CVE-2026-16812 affect?
CVE-2026-16812 affects Arista VeloCloud Orchestrator. VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality and impact the VCO host. Successful exploitation may compromise the confidentiality, integrity, and availability of the orchestrator and data managed by the orchestrator. This functionality was intended to be for internal use only and is not intended to be remotely accessible. Hosted and Dedicated versions of VCO have already been patched in advance of this notice going out. This issue was discovered externally and is known to be actively exploited.
How severe is CVE-2026-16812?
CVE-2026-16812 is rated CRITICAL with a CVSS base score of 10. EPSS puts the probability of exploitation in the next 30 days at 1.8%, higher than 78.2% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 30 July 2026.
How should organisations respond to CVE-2026-16812?
Apply the vendor patch for Arista VeloCloud Orchestrator as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.