# CVE-2026-73444

## Summary

- **CVE ID:** CVE-2026-73444
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-303
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.

## 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 (0)

## References

- [CNA](https://www.arista.com/en/support/advisories-notices/security-advisory/24713-security-advisory-0157)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._