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CVE-2026-2379— Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled

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 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，该漏洞源于在特定情况下，物理接口抖动和代理重启可能导致IPsec隧道重新建立，造成序列号不匹配，可能引起通信不稳定。以下产品及版本受到影响：Arista EOS。

CVSS 5.9 · Medium EPSS 0.23% · P12

Affected Version Matrix 8

VendorProduct Version RangeStatus
Arista Networks EOS 4.34.0≤ 4.34.3M affected
4.33.0M≤ 4.33.5M affected
4.32.0M≤ 4.32.7M affected
4.31.0M≤ 4.31.9M affected
4.30.0F< 4.31.0 affected
4.29.0F< 4.30.0 affected
4.28.0F< 4.29.0 affected
4.27.1F< 4.28.0 affected
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I. Basic Information for CVE-2026-2379

Vulnerability Information
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Vulnerability Title
Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms with hardware IPSec support running Arista EOS with certain IPsec features enabled, EOS may exhibit unexpected behavior in specific cases. Physical interface flaps and certain agent restarts can cause IPsec tunnel re-establishment with existing Security Associations, resulting in sequence number mismatches between tunnel endpoints potentially causing unstable communication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在过期或释放后对资源进行操作
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，该漏洞源于在特定情况下，物理接口抖动和代理重启可能导致IPsec隧道重新建立，造成序列号不匹配，可能引起通信不稳定。以下产品及版本受到影响：Arista EOS。
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 4.34.0 ~ 4.34.3M -

II. Public POCs for CVE-2026-2379

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III. Intelligence Information for CVE-2026-2379

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Vendor Advisories for CVE-2026-2379 (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-2026-7473 5.8 MEDIUM Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
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-672

V. Comments for CVE-2026-2379

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