CVE-2026-7473
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Deadline for federal agencies: 2026-06-23.
8 articles across 5 outlets · first covered Jun 9, 2026 · latest Jun 10, 2026
Coverage timeline
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CISA flags Arista, Chrome, Cisco flaws; patch by June 23securityaffairs.com · Jun 10, 2026
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Havoc Stager Uses Fake Invoices to Hit South American Firmssecurityonline.info · Jun 10, 2026
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Architectural Exposure: Developers Extract Apple’s Subterranean Core Prompts for Siri AIsecurityonline.info · Jun 10, 2026
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Critical Check Point VPN Flaw Under Active Attack Amid New CVEssecurityonline.info · Jun 10, 2026
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Arista zero day EOS flaw exploited, CISA urges mitigationwww.securityweek.com · Jun 10, 2026
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CISA warns of critical flaws in Chromium, Arista and Cisco gearsecurityonline.info · Jun 10, 2026
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CISA Adds Arista EOS Flaw to KEV Catalog, Urges Patchwww.cisa.gov · Jun 9, 2026
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CISA confirms active exploitation of Arista EOS CVE-2026-7473 flawcisa.gov · Jun 9, 2026