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Vulnerability Detail

CVE-2026-73443 Verified Sceawere Triage Sources: NVD / CISA KEV

Vulnerability Metadata

Severity
Medium
Score / CVSS
4.7
Creation Date
1d ago
Vendor
Arista Networks
Product
EOS
Attack Type
CWE-294 Authentication Bypass by Capture-replay
Vector String
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack Complexity
LOW

Narrative and Response

Description

On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indefinitely. Replayed advertisements can be used to advertise stale VRRP state, for example to prevent a backup router from taking over the virtual gateway after the original master has gone down, resulting in a denial of service for hosts using the virtual gateway address.

Executive Summary

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Technical Details

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Mitigations

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References

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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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Additional Metadata

{
  "score": "4.7",
  "pubDate": "2026-09-16T19:17:31.330Z",
  "pubdate": "2026-09-16T19:17:31.330Z"
}
CVE-2026-73443: CVE-2026-73443 Vulnerability (MEDIUM Severity, CVSS: 4.7) | Sceawere