Arista VeloCloud Orchestrator Improper Input Validation Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-09-22
• Critical severity: CVSS 10.0

[ Description ]Official 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. Hosted, including Dedicated, versions of VCO were impacted and have already been patched.

CISA: Arista VeloCloud Orchestrator (VCO) on-prem contains an improper input validation 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 25 Sep 2026): 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.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• www.arista.com/en/support/advisories-notices/security-advisory/24765-security-advisory-…MitigationVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource