Medium 4.7Published Sep 16, 2026

CVE-2026-73443On 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 indef

Updated under an hour ago (2026-10-19 08:00 UTC)

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It affects Arista Networks EOS. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Arista Networks EOS

Exploited in the last 30 days

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.

CVSS: 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Weakness (CWE): CWE-294
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Arista
NVD analysis: Awaiting Analysis
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Arista Networks EOS arista_networks:eos (from the name)	from 4.36.0 through 4.36.1F; fixed at 4.36.2F; from 4.35.0 through 4.35.5M; fixed at 4.35.6M; from 4.34.0 through 4.34.7M; fixed at 4.34.8M; from 4.33.0 through 4.33.9M; fixed at 4.33.10M	CNA record

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24713-security-advisory-0157vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.