CVE-2026-16812: Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability

In short

Arista VeloCloud Orchestrator has a weakness classified as OS command injection (CWE-78). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-07-27. NVD lists CVSS 4.0 at 10 CRITICAL.

What it is

“Arista VeloCloud Orchestrator On-Prem contains an OS command injection vulnerability that 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.” — CISA KEV, retrieved 2026-11-01

“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.” — NVD, retrieved 2026-11-01

Who is affected

Arista VeloCloud Orchestrator. NVD lists the following versions as affected:

• Versions from 5.2.0 inclusive, before 5.2.3.14
• Versions from 6.1.0 inclusive, before 6.1.3.4
• Versions from 6.4.0 inclusive, before 6.4.2.4
• Versions version 7.0.0

Exploitation status

CISA KEV added: 2026-07-27. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-07-30.

Scores

NVD CVSS 4.0: 10 CRITICAL; vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:X/R:X/V:X/RE:X/U:X; source [email protected].

EPSS by FIRST: 1.76%; percentile 78.00; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-78.

Timeline

CISA 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.” — CISA KEV

What to do

• Confirm whether you run Arista VeloCloud Orchestrator and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Mitigation, Vendor Advisory: https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.