CVE-2026-16812
VeloCloud Orchestrator OS Command Injection
Description
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.
In plain language
AI Act nowCVE-2026-16812 is a critical security flaw in Arista VeloCloud Orchestrator that lets an internet attacker run commands on your system without any login; if your on-prem setup is not updated to the fixed versions, you should treat this as an urgent emergency.
Unauthenticated OS command injection in VeloCloud Orchestrator On-Prem enables a remote attacker to execute arbitrary commands with elevated privileges; the flaw is confirmed being exploited in the wild and is listed in CISA KEV with a near-term due date.
CVSS Vector Breakdown
AV:NAttack VectorAC:LAttack ComplexityPR:NPrivileges RequiredUI:NUser InteractionS:CScopeC:HConfidentialityI:HIntegrityA:HAvailabilityWeaknesses
Affected Products
Exploitability
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Attack Graph
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 techniqueReferences
- Critical Arista VeloCloud Orchestrator Vulnerability Exploited as Zero-Dayen-us·SecurityWeek· Exploited VeloCloud Orchestrator rce
- Attackers Exploit Arista VeloCloud Orchestrator Command Injection Flawen·The Hacker News· Exploited VeloCloud Orchestrator rce
- Arista patches VeloCloud Orchestrator zero-day exploited in attacksen-us·BleepingComputer· Exploited VeloCloud Orchestrator zero-day
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