
Critical Zero-Day in Arista VeloCloud Orchestrator Exposes SD-WAN Infrastructure Risk
In September 2026, Arista Networks disclosed CVE-2026-93952, a maximum-severity zero-day vulnerability in VeloCloud Orchestrator (VCO) On-Prem deployments that was being actively exploited. The flaw stems from improper input validation in certificate-based authentication, allowing remote attackers to access privileged internal VCO host functionality without requiring system privileges or user interaction. The U.S. CISA immediately added the vulnerability to its Known Exploited Vulnerabilities catalog and mandated federal agencies secure their networks within 48 hours. This incident highlights the escalating threat to SD-WAN infrastructure as organizations increasingly rely on hybrid connectivity solutions. With Arista being a Fortune 500 company serving over 10,000 customers worldwide, this zero-day demonstrates how critical network infrastructure remains a high-value target for sophisticated threat actors seeking to compromise enterprise connectivity and potentially pivot to broader network access.
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