Vulnerability · Published Sep 16, 2026 · Assigned by Arista

CVE-2026-73463Security Advisory 0169

Medium 5.3

In plain English

A medium-severity race condition in EOS from Arista Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 88.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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 An authenticated user whose access was revoked by the new policy may retain unauthorized access to gRPC interfaces.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

Affected products (as reported)

Vendor	Product	Versions
Arista Networks	EOS	4.36.0F – through 4.36.0.1F4.35.0F – through 4.35.5M4.34.0F – through 4.34.7M4.33.0F – through 4.33.8M4.32.0F – through 4.32.11M4.31.0F – through 4.31.10M

Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

References

Security Advisory 0169 vendor-advisory