Detections
Analytics

CVE-2026-73450

high

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.

References

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

Details

Source: Mitre, NVD

Published: 2026-09-16

Updated: 2026-09-16

Risk Information

CVSS v2

Base Score: 5.3

Vector: CVSS2#AV:A/AC:H/Au:N/C:N/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 6.9

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H

Severity: Medium

CVSS v4

Base Score: 7

Vector: 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

Severity: High

EPSS

EPSS: 0.00132