Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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.

在运行 Arista EOS 且已配置动态主机配置协议（DHCP）中继/嗅探功能，并启用了信息选项（Option 82）的平台，或者 DHCP 服务器已根据信息选项配置匹配条件的平台上，一个未认证的攻击者若连接到已配置中继的面向客户端的 VLAN，可发送一个特制的数据包，导致 DHCP 中继服务重启。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-19655

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Affected Products

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

II. Public POCs for CVE-2026-19655

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-19655

请登录查看更多情报信息。

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

V. Comments for CVE-2026-19655

No comments yet

Leave a comment