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CVE-2026-73450— Security Advisory 0161

Quick assessment

Affected
Arista Networks EOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在运行 Arista EOS 并配置了 MLAG 双主检测（Dual Primary Detection）的受影响平台上，能够访问双主检测网络段的未认证攻击者可以发送特制数据包来干扰双主状态。如果此时 MLAG 主交换机发生故障，而网络中仍存在这些特制数据包，从交换机将错误地判断自身处于双主状态，并因此禁用其接口（err-disable），导致流量中断。

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-73450

Vulnerability Information
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Vulnerability Title
Security Advisory 0161
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.36.0 ~ 4.36.1F -

II. Public POCs for CVE-2026-73450

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III. Intelligence Information for CVE-2026-73450

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Other References for CVE-2026-73450 (1)

Same Patch Batch · Arista Networks · 2026-09-16 · 4 CVEs total

CVE-2026-73447 9.1 CRITICAL Security Advisory 0162 - gNSI Certz/Bootz OS Command Injection via Crafted Rotate Request
CVE-2026-86108 8.0 HIGH Security Advisory 0181
CVE-2026-86109 6.6 MEDIUM Security Advisory 0182

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-345

V. Comments for CVE-2026-73450

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