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CVE-2026-16812

critical

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.

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144

https://www.theregister.com/security/2026/07/28/arista-patches-actively-exploited-velocloud-bug-as-cisa-puts-admins-on-the-clock/5279414

https://www.securityweek.com/critical-arista-velocloud-orchestrator-vulnerability-exploited-as-zero-day/

https://thehackernews.com/2026/07/attackers-exploit-arista-velocloud.html

https://securityaffairs.com/196130/security/u-s-cisa-adds-arista-velocloud-orchestrator-and-fortinet-fortios-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.bleepingcomputer.com/news/security/arista-patches-velocloud-orchestrator-zero-day-exploited-in-attacks/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-16812

Details

Source: Mitre, NVD

Published: 2026-07-27

Updated: 2026-07-28

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 10

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

Severity: Critical

CVSS v4

Base Score: 10

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

Severity: Critical

EPSS

EPSS: 0.0098

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest