CVE-2026-7473

KEVArista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

Description

Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.

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 4.0 vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

PublishedJun 5, 2026

Last modifiedOct 25, 2026

Added to KEVJun 9, 2026

Remediation dueJun 23, 2026

References

arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137Broken Link
arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137MitigationVendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473US Government Resource

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Risk assessment · High

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 125 days
CVSS: 6.9 MEDIUM
EPSS (30-day exploit probability): 1.1% · top 34% of all CVEs
Weakness: CWE-1023
Attack vector: Network, remotely reachable
Preconditions: No privileges and no user interaction

Recommended actions

1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.