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CVE-2026-77190— Security Advisory 0177

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 的受影响平台上，与交换机网络相邻且能够连接到配置了 PIM 稀疏模式（PIM Sparse Mode）和 MLAG 的设备，未认证的攻击者可以发送格式错误的消息，导致 Pimsm 代理意外终止。Pimsm 代理会自动重启，但重复的攻击可能导致该代理持续重启，从而造成持续的服务拒绝（DoS）。

CVSS 6.5 · Medium EPSS 0.28% · P21

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0F≤ 4.36.1F affected
4.35.0F≤ 4.35.5M affected
4.34.2F≤ 4.34.7M affected
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I. Basic Information for CVE-2026-77190

Vulnerability Information
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Vulnerability Title
Security Advisory 0177
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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-2026-77190

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III. Intelligence Information for CVE-2026-77190

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Other References for CVE-2026-77190 (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-2026-86108 8.0 HIGH Security Advisory 0181
CVE-2026-73461 8.0 HIGH Security Advisory 0163
CVE-2026-73455 7.5 HIGH Security Advisory 0173
CVE-2026-73439 7.5 HIGH Security Advisory 0164
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-2026-73468 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 → →

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-20