# CVE-2026-73446

## Summary

- **CVE ID:** CVE-2026-73446
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H)
- **CWE:** CWE-696
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

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.

## Affected Products

- Arista Networks — EOS (4.36.0)
- Arista Networks — EOS (4.35.0)
- Arista Networks — EOS (4.34.0)
- Arista Networks — EOS (4.33.0)
- Arista Networks — EOS (4.32.0)
- Arista Networks — EOS (4.31.0)

## References

- [CNA](https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._