CVE-2026-7473
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Arista Extensible Operating System
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 9 June 2026. US federal agencies were required to remediate it by 23 June 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 1.1%, which is higher than 62.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Frequently asked questions
Is CVE-2026-7473 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-7473.
What does CVE-2026-7473 affect?
CVE-2026-7473 affects Arista Extensible Operating System. 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.
How severe is CVE-2026-7473?
CVE-2026-7473 is rated MEDIUM with a CVSS base score of 5.8. EPSS puts the probability of exploitation in the next 30 days at 1.1%, higher than 62.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 23 June 2026.
How should organisations respond to CVE-2026-7473?
Apply the vendor patch for Arista Extensible Operating System as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.