Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-16812

VeloCloud Orchestrator OS Command Injection

Arista / VeloCloud Orchestrator On-Prem · affected before 5.2.3.14

Watch CVE-2026-16812 Browse KEV feed
Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
1.0%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-16812 is an unauthenticated VeloCloud Orchestrator OS Command Injection affecting Arista VeloCloud Orchestrator On-Prem. VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Arista / VeloCloud Orchestrator On-Prem affected before 5.2.3.14.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

VeloCloud Orchestrator OS Command Injection

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.

Arista Networks Affected
VeloCloud Orchestrator On-Prem
Before 5.2.3.14 Before 6.1.3.4 Before 6.4.2.4 Before 7.0.0.1
View vendor advisory (opens in new tab)
Published
27 Jul 2026
Exploitation Reported
27 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-16812
  • Security Advisory 0144 arista.com · Vendor Advisory https://www.arista.com/en/support/advisories-notices/security-advisor...

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 27 Jul 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CVE First 2026-07-27 16:20 UTC
CISA 2026-07-27 19:00 UTC
The Hacker News 2026-07-28 04:43 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

10.0 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

1.0%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

Recent mention · The Hacker News

New CVSS 10.0 VeloCloud Orchestrator Flaw Actively Exploited in Certificate-Based Setups

Swati KhandelwalSep 22, 2026Vulnerability / Network Security Attackers are exploiting a new flaw in on-premises VeloCloud Orchestrator (VCO), the server that manages the Edge devices in a VeloCloud SD-WAN, Arista said on September 22. The flaw, tracked as CVE-2026-93952, may...

Read full advisory

All CVSS Scores

CVSS v4.0 10.0 Critical

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

CVSS v3.1 10.0 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

All Mentions

Recent mention · The Hacker News

New CVSS 10.0 VeloCloud Orchestrator Flaw Actively Exploited in Certificate-Based Setups

The Hacker News · 22 Sep 2026

Swati KhandelwalSep 22, 2026Vulnerability / Network Security Attackers are exploiting a new flaw in on-premises VeloCloud Orchestrator (VCO), the server that manages the Edge devices in a VeloCloud SD-WAN, Arista said on September 22. The flaw, tracked as CVE-2026-93952, may allow a remote attacker with no login access to privilege internal functions and affect the VCO host. Only orchestrators set up to authenticate their Edges with certificates are exposed. As of September 22, fixed releases are out for the 5.2 and 6.4 release trains, but not yet for the 6.1 and 7.0 trains. Arista has...

Recent mention · The Hacker News

Attackers Exploit Arista VeloCloud Orchestrator Command Injection Flaw

The Hacker News · 28 Jul 2026

A maximum-severity security flaw impacting on-premises versions of Arista VeloCloud Orchestrator (VCO) has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-16812 (CVSS score: 10.0), is a case of operating system command injection that could pave the way for arbitrary code execution. "VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue

Timeline

From disclosure to observed exploitation

  1. 04:43 UTC

    KEV confirmed by The Hacker News

    Exploitation attested by an external source

  2. 19:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 16:20 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. 16:11 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 21:46 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-16812

Sample API response 
{
  "cve_id": "CVE-2026-16812",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.01001,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}