Vulnerability · Published Sep 16, 2026 · Assigned by Arista

CVE-2026-73445Security Advisory 0167

Medium 4.9

In plain English

A medium-severity improper input validation 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 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)4.9Medium

Exploit odds (30 days)0.4%top 71.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

On affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue 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 – before 4.33.0F4.31.0F – before 4.32.0F

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

References

Security Advisory 0167 vendor-advisory