# CVE-2026-73458

## Summary

- **CVE ID:** CVE-2026-73458
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H)
- **CWE:** CWE-303
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

## 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)

## References

- [CNA](https://www.arista.com/en/support/advisories-notices/security-advisory/24710-security-advisory-0154)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 32.1

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