# CVE-2026-16812 — Arista Networks VeloCloud Orchestrator On-Prem **CISA KEV** > As of 2026-07-28, CVE-2026-16812 is a CRITICAL-severity vulnerability in Arista Networks VeloCloud Orchestrator On-Prem, CVSS v3.1 10, EPSS 0.8% (55.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-07-27), with a US federal remediation deadline of 2026-07-30. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-16812, most recently “CVE-2026-16812 — Critical Unauthenticated OS Command Injection in Arista VeloCloud Orchestrator Actively Exploited”. **Last updated:** 2026-07-28 ## What is CVE-2026-16812? 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. The record classifies CVE-2026-16812 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 70 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 10 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`) - **CVSS v4.0 base score:** 10 (`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/S:P`) - **EPSS (FIRST):** 0.8% probability of exploitation in the next 30 days, higher than 55.6% of all scored CVEs - **CISA KEV:** Listed since 2026-07-27, federal remediation deadline 2026-07-30 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2026-07-27, last modified 2026-07-28 ## Is CVE-2026-16812 being exploited? CISA added CVE-2026-16812 to the Known Exploited Vulnerabilities catalog on 2026-07-27, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-07-30 under BOD 22-01. It currently carries a trending score of 52 in the Threadlinqs vulnerability feed. ## Affected products and versions - [Arista Networks](https://intel.threadlinqs.com/vendors/arista-networks): VeloCloud Orchestrator On-Prem ## How to fix CVE-2026-16812 Vendor advisory: [https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144](https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144). Because CVE-2026-16812 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-07-30. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory. ## Threat activity tracking CVE-2026-16812 2 tracked threats in the Threadlinqs corpus reference CVE-2026-16812, either in the campaign’s CVE list or as an indicator on the campaign record. - [CVE-2026-16812 — Critical Unauthenticated OS Command Injection in Arista VeloCloud Orchestrator Actively Exploited](https://intel.threadlinqs.com/threat/TL-2026-1851) — CRITICAL · 2026-08-03 - [CISA Adds Two Known Exploited Vulnerabilities to Catalog: Fortinet FortiOS Information Disclosure (CVE-2025-68686) and Arista VeloCloud Orchestrator OS Command Injection (CVE-2026-16812)](https://intel.threadlinqs.com/threat/TL-2026-1725) — CRITICAL · 2026-07-27 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-04. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [arista.com — vendor advisory](https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144) Canonical: https://intel.threadlinqs.com/cve/CVE-2026-16812 Full detection coverage and IOCs for threats exploiting CVE-2026-16812 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp