CVE-2026-73450 — MEDIUM (6.9)

Vulnerability 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 Score

6.9

MEDIUM

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

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

LOW

Availability

HIGH

Related Weaknesses (CWE)

CWE-345

References

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

FAQ

What is CVE-2026-73450?

CVE-2026-73450 is a vulnerability with a CVSS score of 6.9 (MEDIUM). 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 p...

How severe is CVE-2026-73450?

CVE-2026-73450 has been rated MEDIUM with a CVSS base score of 6.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-73450?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.