CVE-2026-73453

published 2026-09-16

CVE-2026-73453: An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions…

Priority P2 68 critical 10 CVSS 3.1

AV N AC L PR N UI N S C C H I H A H

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

8 ranges

Vendor	Product	Version range	Fixed in
arista_networks	eos	>= 4.29.2F < 4.30.0F	4.30.0F
arista_networks	eos	>= 4.30.0F < 4.31.0F	4.31.0F
arista_networks	eos	>= 4.31.0F < 4.32.0F	4.32.0F
arista_networks	eos	>= 4.32.0F < 4.33.0F	4.33.0F
arista_networks	eos	>= 4.33.0F < 4.34.0F	4.34.0F
arista_networks	eos	4.34.0F – 4.34.7M	—
arista_networks	eos	4.35.0F – 4.35.5M	—
arista_networks	eos	4.36.0F – 4.36.1F	—

CVSS provenance

nvd v3.1 10.0 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd v4.0 9.5 CRITICAL CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-94