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CVE-2026-73453: Security Advisory 0174
- Severity: critical (CVSS 10.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-16 · updated 2026-09-17
- Weakness: CWE-94
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
- Arista Networks EOS: from 4.36.0F through 4.36.1F; from 4.35.0F through 4.35.5M; from 4.34.0F through 4.34.7M; from 4.33.0F before 4.34.0F; from 4.32.0F before 4.33.0F; from 4.31.0F before 4.32.0F — fixed in 4.30.0F, 4.31.0F, 4.32.0F, 4.33.0F, 4.34.0F
How to fix
Upgrade to a fixed version: Arista Networks EOS 4.30.0F, 4.31.0F, 4.32.0F, 4.33.0F. Check the vendor advisory for mitigations.
References
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