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CVE-2026-7473

Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

Published: Jun 5, 2026Updated: Jun 9, 2026 Sources: CVE List NVD BDUCWE-1023
NVD MITRE
5.8CVSSMEDIUM
EPSS Score
0.4%
Top 70.6%
CISA KEV
Active Exploitation
Since Jun 9, 2026
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-1023

Affected Products

eosaristaNetworking Infrastructure
EOSArista Networks
On-prem
Networking Infrastructure / router-switch
Arista EOSArista Networks, Inc.
aristacommercialUSNetworking Infrastructure
arista networkscommercialUSNetworking Infrastructureaka arista networks

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 9, 2026
Remediation due:Jun 23, 2026

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.

Official Patch Available
Workaround Available

References

https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
arista.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473
cisa.gov
and 2 more references View all →

Timeline

Published
Jun 5, 2026
Added to CISA KEV
Jun 9, 2026
Last Updated
Jun 9, 2026
News mentions
3

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