CVE-2026-73450
Security Advisory 0161
- State
- Published
- Severity
- 7.0 High
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Aug 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.0 High | 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 | Arista |
| 3.1 | 6.9 Medium | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H | Arista |
Weaknesses
- CWE-345 Insufficient Verification of Data Authenticity
Affected Products
| Product | Versions |
|---|---|
EOSArista Networks |
|
References
- Security Advisory 0161vendor-advisory
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