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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 EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0≤ 4.36.1F affected
4.35.0≤ 4.35.5M affected
4.34.0≤ 4.34.7.1M affected
4.33.0≤ 4.33.9M affected
0.0.0< 4.33.0 affected
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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 · 28 CVEs total

CVE-2026-73456 10.0 CRITICAL Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request
CVE-2026-73453 10.0 CRITICAL Security Advisory 0174
CVE-2026-86106 9.6 CRITICAL Security Advisory 0179
CVE-2026-73447 9.1 CRITICAL Security Advisory 0162 - gNSI Certz/Bootz OS Command Injection via Crafted Rotate Request
CVE-2026-73464 8.8 HIGH Security Advisory 0166
CVE-2026-73435 8.2 HIGH Security Advisory 0171
CVE-2026-73454 8.1 HIGH Security Advisory 0165
CVE-2026-73461 8.0 HIGH Security Advisory 0163
CVE-2026-86108 8.0 HIGH Security Advisory 0181
CVE-2026-73439 7.5 HIGH Security Advisory 0164
CVE-2026-73455 7.5 HIGH Security Advisory 0173
CVE-2026-2380 7.4 HIGH Security Advisory 0168
CVE-2026-86109 6.6 MEDIUM Security Advisory 0182
CVE-2026-73462 6.5 MEDIUM On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) sn
CVE-2026-77190 6.5 MEDIUM Security Advisory 0177
CVE-2026-73468 6.5 MEDIUM Security Advisory 0175
CVE-2026-73436 6.5 MEDIUM Security Advisory 0171
CVE-2026-86107 5.9 MEDIUM Security Advisory 0180
CVE-2026-73469 5.8 MEDIUM Security Advisory 0176
CVE-2026-73438 5.3 MEDIUM Security Advisory 0172

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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