What’s Vulnerable › Vulnerabilities
CVE-2026-73450: Security Advisory 0161
- Severity: medium (CVSS 6.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-16 · updated 2026-09-17
- Weakness: CWE-345
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.
Affected products
- Arista Networks EOS: from 4.36.0 through 4.36.1F; from 4.35.0 through 4.35.5M; from 4.34.0 through 4.34.7.1M; from 4.33.0 through 4.33.9M; before 4.33.0 — fixed in 4.33.0
How to fix
Upgrade to a fixed version: Arista Networks EOS 4.33.0. Check the vendor advisory for mitigations.
References
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