What’s Vulnerable › Vulnerabilities

CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-06-09
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-05 · updated 2026-10-25
• Weakness: CWE-1023

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.

Affected products

• Arista Networks EOS: all versions

References

• 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

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