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Vulnerability record · CVE-2026-73450 · published 16 September 2026

CVE-2026-73450: Insufficient verification of data authenticity vulnerability

On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual Primary Detection network segment can send specially crafted packets to interfere with the dual-primary state. If the MLAG primary switch fails while these packets are present, the secondary switch incorrectly concludes it is in a dual-primary condition and err-disables its interfaces, leading to a traffic interruption.

7.0 CVSS 4.0 High EPSS 0.16% · top 95.5% CWE-345 · Insufficient verification of data authenticity Awaiting Analysis
7.0CVSS 4.0 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Sep 2026Last modified by NVD

Description

On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual Primary Detection network segment can send specially crafted packets to interfere with the dual-primary state. If the MLAG primary switch fails while these packets are present, the secondary switch incorrectly concludes it is in a dual-primary condition and err-disables its interfaces, leading to a traffic interruption.

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.arista.com/en/support/advisories-notices/security-advisory/24717-security-advisory-0161

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Source: NIST National Vulnerability Database (record CVE-2026-73450), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.