Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Arista Networks — EOS
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.
5.8
0.8%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- Published
- Jun 5, 2026
- Modified
- Jun 10, 2026
- Added to KEV
- Jun 9, 2026
- Federal patch due
- Jun 23, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2026-7473, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2026-7473 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2026-7473?
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 has a CVSS base score of 5.8 out of 10 (CVSS 3.1).
Is CVE-2026-7473 actively exploited in the wild?
Yes. CVE-2026-7473 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 9, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-7473?
0.8% - meaning FIRST.org's EPSS model estimates a 0.8% probability this vulnerability will be exploited in the wild within 30 days (54% percentile among all scored CVEs).
What type of vulnerability is CVE-2026-7473?
CVE-2026-7473 is classified under CWE-1023 (CWE-1023: Incomplete Comparison with Missing Factors).
Cross-checked against
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