CVE-2026-73463
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BaseFortify

Publication date: 2026-09-16

Last updated on: 2026-09-16

Assigner: Arista Networks, Inc.

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 An authenticated user whose access was revoked by the new policy may retain unauthorized access to gRPC interfaces.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.

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Meta Information

Published
2026-09-16
Last Modified
2026-09-16
Generated
2026-10-06
AI Q&A
2026-09-16
EPSS Evaluated
2026-10-05
NVD
CVE-2026-73463
EUVD
EUVD-2026-80319

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
Arista Networks EOS 4.36.0F
Arista Networks EOS 4.35.0F
Arista Networks EOS 4.34.0F
Arista Networks EOS 4.33.0F
Arista Networks EOS 4.32.0F
Arista Networks EOS 4.31.0F

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

This vulnerability involves a race condition in the gNSI Authz service on Arista EOS platforms when multiple gRPC Network Security Interface transports are configured. It may cause a policy rotation to fail silently, allowing an authenticated user whose access was revoked to retain unauthorized access to gRPC interfaces.

Impact Analysis

An attacker with valid credentials could retain access to sensitive gRPC interfaces even after their permissions were revoked. This could lead to unauthorized configuration changes, data exfiltration, or other malicious activities depending on the gRPC service permissions.

Compliance Impact

This vulnerability could violate compliance requirements that mandate strict access controls and timely revocation of permissions, such as GDPR's data protection principles or HIPAA's access control safeguards. Unauthorized access retention risks non-compliance with these regulations.

Mitigation Strategies

Review gNSI Authz service configurations for race conditions during policy rotation. Ensure only one gRPC Network Security Interface transport is active at a time. Monitor access logs for unauthorized gRPC interface access attempts.

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