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9.2

Arista EOS switches can be taken over via crafted request

CVE-2026-73456 · published 5 days ago
Summary

Switches running Arista EOS with the gNPSI feature turned on can be accessed by anyone on the network. An attacker could send a specially crafted message that runs code on the switch and gives them full administrative rights. Apply the latest Arista software update and disable gNPSI unless it is required for your operations.

What to do
  • Update arista networks eos to version 4.36.2F.
Affected software
VendorProductAffected versions
arista networks eos <= 4.36.1F
Fix: upgrade to 4.36.2F
Original advisory text
Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.
Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.
References
Severity
9.2 Critical
CVSS 3.1: 10.0 (MITRE)
Exploitation
EPSS <1%
Type
CWE-94Code Injection
Timeline
Published16 Sep 2026
Updated21 Sep 2026
First seen16 Sep 2026
Sources
CVE-2026-73456 · NVD
CVE-2026-73456 · MITRE
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