CVE-2026-16812
Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
July 27, 2026, 4:17 p.m.
Last Modified :
July 28, 2026, 2:50 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
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.
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.
Unknown
https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: 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
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7 | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 4.0 | CRITICAL | c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Apply the available patch for VCO on-prem.
- Restrict internal functionality access.
- Monitor for unauthorized access attempts.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-16812.
| URL | Resource |
|---|---|
| https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144 | Mitigation Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-16812 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-16812 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-16812
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-16812 vulnerability anywhere in the article.
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TheCyberThrone
CISA Expands KEV Catalog with FortiOS and Arista VeloCloud Flaws
July 29, 2026The Cybersecurity and Infrastructure Security Agency (CISA) has expanded its Known Exploited Vulnerabilities (KEV) Catalog by adding two vulnerabilities affecting Fortinet FortiOS and Ari ... Read more
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security.nl
Arista waarschuwt voor actief misbruik van kritiek lek in VeloCloud Orchestrator
Aanvallers maken actief misbruik van een kritieke kwetsbaarheid in VeloCloud Orchestrator (VCO), een beheerplatform voor het configureren, monitoren en beheren van van VeloCloud SD-WAN-netwerken. Via ... Read more
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The Hacker News
Attackers Exploit Arista VeloCloud Orchestrator Command Injection Flaw
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 (CVS ... Read more
The following table lists the changes that have been made to the
CVE-2026-16812 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 28, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:arista:velocloud_orchestrator:*:*:*:*:*:*:*:* versions from (including) 5.2.0 up to (excluding) 5.2.3.14 *cpe:2.3:a:arista:velocloud_orchestrator:*:*:*:*:*:*:*:* versions from (including) 6.1.0 up to (excluding) 6.1.3.4 *cpe:2.3:a:arista:velocloud_orchestrator:*:*:*:*:*:*:*:* versions from (including) 6.4.0 up to (excluding) 6.4.2.4 *cpe:2.3:a:arista:velocloud_orchestrator:7.0.0:*:*:*:*:*:*:* Added Reference Type Arista Networks, Inc.: https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144 Types: Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-16812 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 28, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T19:45:04.589433Z'} {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T00:00:00+00:00'} -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Jul. 27, 2026
Action Type Old Value New Value Added Date Added 2026-07-27 Added Due Date 2026-07-27 Added Required Action 2026-07-27 Added Vulnerability Name 2026-07-27 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 27, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-16812 Changed SSVC {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T16:58:39.813859Z'} {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T19:45:04.589433Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 27, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T16:54:19.443644Z'} {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T16:58:39.813859Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 27, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-16812', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-27T16:54:19.443644Z'} -
New CVE Received by [email protected]
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Arista Networks', 'product': 'VeloCloud Orchestrator On-Prem', 'versions': [{'status': 'affected', 'version': '5.2.0', 'lessThan': '5.2.3.14', 'versionType': 'custom'}, {'status': 'affected', 'version': '6.1.0', 'lessThan': '6.1.3.4', 'versionType': 'custom'}, {'status': 'affected', 'version': '6.4.0', 'lessThan': '6.4.2.4', 'versionType': 'custom'}, {'status': 'affected', 'version': '7.0.0', 'lessThan': '7.0.0.1', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-78 Added Reference https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144