CVE-2026-73453 Arista EOS - Remote Code Execution

Arista EOS contains a remote code execution caused by crafted malicious packets during P4Runtime session initiation, letting unauthenticated attackers gain complete administrative control, exploit requires P4Runtime enabled and network access.

CVSS base score 10.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.69% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Disable P4Runtime if not needed or update to the latest Arista EOS version with the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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