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CVE-2026-7473— Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass

Quick assessment

Affected
Arista Networks EOS
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arista EOS是美国Arista公司的一个完全可编程的、高度模块化的、基于Linux的网络操作系统。 Arista EOS存在安全漏洞，该漏洞源于存在隧道解封装配置时，交换机未验证隧道协议类型，可能错误解封装并转发其他意外的隧道数据包，导致意外处理非配置的隧道流量。

CVSS 5.8 · Medium KEV EPSS 0.65% · P49

Affected Version Matrix 7

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0 affected
4.35.0≤ 4.35 affected
4.34.0≤ 4.34 affected
4.33.0≤ 4.33 affected
4.32.0≤ 4.32 affected
4.31.0≤ 4.31 affected
*≤ 4.30 affected
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I. Basic Information for CVE-2026-7473

Vulnerability Information
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Vulnerability Title
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺失要素致使对比不完全
Source: CVE Program / CVE List V5
Vulnerability Title
Arista EOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arista EOS是美国Arista公司的一个完全可编程的、高度模块化的、基于Linux的网络操作系统。 Arista EOS存在安全漏洞，该漏洞源于存在隧道解封装配置时，交换机未验证隧道协议类型，可能错误解封装并转发其他意外的隧道数据包，导致意外处理非配置的隧道流量。
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 4.36.0 -

II. Public POCs for CVE-2026-7473

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III. Intelligence Information for CVE-2026-7473

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Vendor Advisories for CVE-2026-7473 (1)

Same Patch Batch · Arista Networks · 2026-06-05 · 10 CVEs total

CVE-2025-5088 8.3 HIGH Arista CloudVision Exchange (CVX) Cluster Privilege Escalation via MCS Redis Session
CVE-2025-5089 6.5 MEDIUM Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages
CVE-2025-5090 6.5 MEDIUM Arista CloudVision Exchange Cluster Instability via Unexpected Switch Messages
CVE-2026-25621 6.0 MEDIUM Arista Edge Threat Management NGFW Reports Application Insecure Input Validation
CVE-2026-25622 6.0 MEDIUM Arista Edge Threat Management NGFW Captive Portal Custom Handler Command Injection
CVE-2026-25620 6.0 MEDIUM Arista Edge Threat Management NGFW Captive Portal Encrypted Password Command Injection
CVE-2026-25623 6.0 MEDIUM Arista Edge Threat Management NGFW UI Arbitrary Command Execution
CVE-2026-2379 5.9 MEDIUM Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is D
CVE-2026-25624 5.7 MEDIUM Arista Edge Threat Management NGFW UI Administrative Cross-Site Scripting

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-1023

V. Comments for CVE-2026-7473

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