CVE-2026-93952 — VeloCloud Orchestrator (VCO) On-Prem
CRITICALCVE-2026-93952 is a critical-severity (CVSS 10) Improper Input Validation vulnerability in Arista Networks VeloCloud Orchestrator (VCO) On-Prem. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-09-22) — treat it as actively exploited and patch now. Versions up to 5.2.3.15 are affected; the records list no fixed version yet, so check the vendor advisory below.
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 Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-09-22. Federal agencies were required to remediate by 2026-09-25.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-93952.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
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.
Affected Products
VeloCloud Orchestrator (VCO) On-PremArista NetworksDetection & mitigation playbook
Vendor / applianceDetect
Inventory every Arista Networks VeloCloud Orchestrator (VCO) On-Prem deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-93952 (versions up to 5.2.3.15 are affected). Check the Arista Networks VeloCloud Orchestrator (VCO) On-Prem advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-93952 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.