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.
MANARTECH SECURITY ALERT
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
CVE Numbers
CVE-2026-7473
Affected Product
Extensible Operating System — Arista
Threat Description
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.
Severity Scale
CRITICALHIGHMEDIUMLOW
Severity
HIGH
Affected Versions
To be reviewed
Recommended Mitigation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Reference Links
https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473
https://nvd.nist.gov/vuln/detail/CVE-2026-7473