CVE-2026-73456 Arista EOS - Remote Code Execution

Arista EOS contains a remote code execution caused by crafted malicious requests in gRPC Network Packet Sampling Interface (gNPSI), letting unauthenticated attackers gain full administrative control, exploit requires gNPSI enabled.

CVSS base score 10.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.69% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Update to the latest version of Arista EOS with the gNPSI vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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