# CVE-2026-73459

## Summary

- **CVE ID:** CVE-2026-73459
- **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-354
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU can cause the legitimate LSP to be unexpectedly purged from the IS-IS link-state database. This may result in traffic loss.

## Affected Products

- Arista Networks — EOS (4.36.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 6.0

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