Vulnerability · Published Sep 16, 2026 · Assigned by Arista
CVE-2026-73453Security Advisory 0174
Critical 10.0
In plain English
A critical-severity code injection 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 0.7% (higher than 53% of all known vulnerabilities).
Official description
An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch. 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 4.36.1F4.35.0F – through 4.35.5M4.34.0F – through 4.34.7M4.33.0F – before 4.34.0F4.32.0F – before 4.33.0F4.31.0F – before 4.32.0F4.30.0F – before 4.31.0F4.29.2F – before 4.30.0F |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References
- Security Advisory 0174 vendor-advisory