CVE-2026-73463

Security Advisory 0169

State: Published
Severity: 6.0 Medium
Published: Sep 16, 2026
Updated: Sep 16, 2026
Reserved: Aug 12, 2026

Description

On affected platforms running Arista EOS, when multiple gRPC Network Security Interface (gNSI) transports are configured, a race condition in the gNSI Authz service may cause a policy rotation to fail silently. An authenticated user whose access was revoked by the new policy may retain unauthorized access to gRPC interfaces. This does not affect Bootz.

This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	Arista
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N	Arista

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
EOSArista Networks	4.36.0F through 4.36.0.1FAffected 4.35.0F through 4.35.5MAffected 4.34.0F through 4.34.7MAffected 4.33.0F through 4.33.8MAffected 4.32.0F through 4.32.11MAffected 4.31.0F through 4.31.10MAffected

References

Security Advisory 0169vendor-advisory

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