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CVE-2026-73437— On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper/destinat

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 且配置了动态主机配置协议（DHCP）中继的受影响平台上，拥有网络访问权限的未认证攻击者可以发送一个精心构造的 DHCP 应答报文，其源 IP 地址并非配置好的辅助地址（helper address）。中继代理会在未验证来源的情况下，将该报文转发给客户机。这使得攻击者能够向客户机提供恶意的网络配置参数，从而可能导致受影响客户机的流量被拦截或遭受服务拒绝（DoS）攻击。

CVSS 9.6 · Critical
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I. Basic Information for CVE-2026-73437

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper/destinat
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper address, and the relay agent would forward it to clients without validating the source. This could allow the attacker to supply clients with malicious network configuration parameters, potentially resulting in traffic interception or denial of service for affected clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/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-2026-73437

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III. Intelligence Information for CVE-2026-73437

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Vendor Advisories for CVE-2026-73437 (1)

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

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-2026-19655 6.5 MEDIUM On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) r
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-345

V. Comments for CVE-2026-73437

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