What is CVE-2026-73446?

CVE-2026-73446 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-696. CVSS score: 7.4/10. Published 2026-09-16.

How severe is CVE-2026-73446?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-73446

On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-696

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73446?: CVE-2026-73446 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-696. CVSS score: 7.4/10. Published 2026-09-16.
How severe is CVE-2026-73446?: High severity. CVSS v3 base score is 7.4 out of 10.