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CVE-2026-19655— On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthent

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.

Arista Networks EOS是美国Arista Networks公司的一款面向数据中心与云环境的高可编程网络设备操作系统。 Arista Networks EOS 4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7.1M版本和4.33.0版本至4.33.9M版本存在输入验证错误漏洞，该漏洞源于在启用了DHCP中继/监听且配置了信息选项（Option 82），或DHCP服务器基于信息选项配置匹配条件时，未认证攻击者连接到配置中继的客户端VLAN可发送特制数据包，导致DHCP Re

CVSS 6.5 · Medium EPSS 0.30% · P23

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 3

VendorProduct Version RangeStatus
Arista Networks EOS 4.35.0≤ 4.35.5M affected
4.34.0≤ 4.34.7.1M affected
4.33.0≤ 4.33.9M affected
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I. Basic Information for CVE-2026-19655

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthent
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.
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
Vulnerability Title
Arista Networks EOS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arista Networks EOS是美国Arista Networks公司的一款面向数据中心与云环境的高可编程网络设备操作系统。 Arista Networks EOS 4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7.1M版本和4.33.0版本至4.33.9M版本存在输入验证错误漏洞，该漏洞源于在启用了DHCP中继/监听且配置了信息选项（Option 82），或DHCP服务器基于信息选项配置匹配条件时，未认证攻击者连接到配置中继的客户端VLAN可发送特制数据包，导致DHCP Re
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.35.0 ~ 4.35.5M -

II. Public POCs for CVE-2026-19655

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III. Intelligence Information for CVE-2026-19655

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Vendor Advisories for CVE-2026-19655 (1)

Same Patch Batch · Arista Networks · 2026-09-15 · 12 CVEs total

CVE-2026-73437 9.6 CRITICAL On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) r
CVE-2026-73458 8.2 HIGH On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detec
CVE-2026-73459 7.4 HIGH Security Advisory 0160
CVE-2026-73446 7.4 HIGH Security Advisory 0160
CVE-2026-73466 6.3 MEDIUM On affected platforms running Arista EOS, under certain circumstances plaintext user passw
CVE-2026-73465 6.3 MEDIUM On affected platforms running Arista EOS, under certain circumstances plaintext private ke
CVE-2026-73467 6.3 MEDIUM On affected platforms running Arista EOS, under certain circumstances plaintext shared sec
CVE-2026-73460 6.1 MEDIUM Security Advisory 0160
CVE-2026-19641 5.3 MEDIUM On affected platforms running Arista EOS with password authentication configured, a specia
CVE-2026-73451 4.8 MEDIUM On affected platforms running Arista EOS with dual switch cards and with ingress Security
CVE-2026-73444 4.7 MEDIUM On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) auth

IV. Related Vulnerabilities

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