CVE-2026-16812: Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 27 Jul 2026, the same day the CVE record was published.
- How likely is exploitation in the next 30 days?
- 1%
EPSS score, percentile 62.7 of all scored records
- How severe?
- 10.0 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline 30 Jul 2026. Apply mitigations in accordance with vendor instructions … Full text
- Which versions are affected?
Affected
- from 5.2.0 to before 5.2.3.14
- from 6.1.0 to before 6.1.3.4
- from 6.4.0 to before 6.4.2.4
- from 7.0.0 to before 7.0.0.1
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
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 due date for this action: 30 July 2026.
Solution (from the CVE record)
The recommended resolution is to upgrade to a fixed VCO release at your earliest convenience. This vulnerability has been fixed in the following releases: * VCO 5.2.3.14 and later in the 5.2 train * VCO 6.1.3.4 and later in the 6.1 train * VCO 6.4.2.4 and later in the 6.4 train
Workaround (from the CVE record)
The recommended resolution is to upgrade to a fixed VCO release as soon as it is available. For VCOs which are not on a supported release train, customers can contact TAC to discuss possible upgrade options for your release. Until the fixed software is deployed, operators should apply defense-in-depth controls appropriate for their environment: * Restrict access to the VCO web interface to trusted administrative networks. * Monitor the VCO for accesses from known malicious source IPs. * Monitor for unexpected outbound network activity from the VCO host. * Review recent administrator activity for unexpected changes.
Advisories and patches
Linked from CISA's catalog entry
- https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-16812
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 5.2.0 to before 5.2.3.14 |
| Affected | from 6.1.0 to before 6.1.3.4 |
| Affected | from 6.4.0 to before 6.4.2.4 |
| Affected | from 7.0.0 to before 7.0.0.1 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2026-16812 to its Known Exploited Vulnerabilities (KEV) catalog on 27 Jul 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 30 Jul 2026.
- The CVE record was published on 27 Jul 2026, the same day it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 10.0 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 1% (percentile 62.7), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Attack patterns (CAPEC)
- CAPEC-88: OS Command Injection
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 27 Jul 2026 | CVE record published |
| 27 Jul 2026 | Added to CISA KEV |
| 28 Jul 2026 | CVE record last updated |
| 30 Jul 2026 | CISA due date for the required action |
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