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CVE-2026-73435— Security Advisory 0171

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.

在配置了开放最短路径优先版本2（OSPFv2）且启用了 OSPFv2 认证机制的受影响的 Arista EOS 平台上，来自同一广播网段内未认证攻击者的精心构造的 OSPFv2 数据包可能导致邻接关系频繁震荡（flapping）及数据包丢失。该干扰可能影响更广泛的 OSPF 域内的路由功能。

CVSS 8.2 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1597 · Search Closed Sources

Affected Version Matrix 5

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0F≤ 4.36.1F affected
4.35.0F≤ 4.35.5M affected
4.34.0F≤ 4.34.7M affected
4.33.0F≤ 4.33.9M affected
1.0.0< 4.33.0F affected
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I. Basic Information for CVE-2026-73435

Vulnerability Information
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Vulnerability Title
Security Advisory 0171
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/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 4.36.0F ~ 4.36.1F -

II. Public POCs for CVE-2026-73435

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III. Intelligence Information for CVE-2026-73435

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Other References for CVE-2026-73435 (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-2026-73454 8.1 HIGH Security Advisory 0165
CVE-2026-86108 8.0 HIGH Security Advisory 0181
CVE-2026-73461 8.0 HIGH Security Advisory 0163
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-2026-73450 6.9 MEDIUM Security Advisory 0161
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