CVE-2026-73456NVD

Vulnerability Summary

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.

Severity Level

CRITICAL(10.0)

Published Date

Sep 16, 2026

Last Modified

Sep 17, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.75%Probability

Root Weakness (CWE)

CWE-94: Code Injection ↗

The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended syntax or behavior.

CVSS v4.0 Base Metrics — Score 9.2 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Attack RequirementsPresent

Privileges RequiredNone

User InteractionNone

Confidentiality (Vulnerable System)High

Integrity (Vulnerable System)High

Availability (Vulnerable System)High

Confidentiality (Subsequent System)None

Integrity (Subsequent System)None

Availability (Subsequent System)None

CVSS v3.1 Base Metrics — Score 10.0 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Arista Networks EOS >= 4.36.0 and <= 4.36.1F
Arista Networks EOS >= 4.35.0 and <= 4.35.5M
Arista Networks EOS >= 4.34.2F and <= 4.34.7M

Patched Versions

Arista Networks EOS 4.36.1F
Arista Networks EOS 4.35.5M
Arista Networks EOS 4.34.7M

📧Email Delivery — Threat intel straight to your inbox.

♾️Unlimited Vendors — Track your entire stack.

🚨All New CVEs — Be the first to know.

⚙️Custom EPSS — Filter noise, focus on risk.

💬Webhooks — Slack & Teams integration.

🚫Ad-Free — Uninterrupted experience.