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CVE-2025-8873— Arista EOS Dataplane Denial of Service via Malformed IPsec Packet

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，该漏洞源于配置IPsec时，特制数据包可能导致数据平面停止处理所有IPsec流量，控制平面可能检测到该情况并尝试重置IPsec处理管道，重置后流量可能无法恢复处理。

CVSS 7.5 · High EPSS 0.39% · P30

Affected Version Matrix 5

VendorProduct Version RangeStatus
Arista Networks EOS 4.33.0M≤ 4.33.4M affected
4.32.0M≤ 4.32.6.1M affected
4.31.0M≤ 4.31.7.1M affected
4.30.0M≤ 4.30.10M affected
4.29.0M≤ 4.29.10.1M affected
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I. Basic Information for CVE-2025-8873

Vulnerability Information
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Vulnerability Title
Arista EOS Dataplane Denial of Service via Malformed IPsec Packet
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After reset traffic may not resume being processed. There is no impact to non-IPsec traffic or to IPsec traffic not originating or terminating on the system. This issue was reported by an Arista customer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1286
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，该漏洞源于配置IPsec时，特制数据包可能导致数据平面停止处理所有IPsec流量，控制平面可能检测到该情况并尝试重置IPsec处理管道，重置后流量可能无法恢复处理。
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 4.33.0M ~ 4.33.4M -

II. Public POCs for CVE-2025-8873

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III. Intelligence Information for CVE-2025-8873

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Vendor Advisories for CVE-2025-8873 (1)

Same Patch Batch · Arista Networks · 2026-06-04 · 6 CVEs total

CVE-2024-27892 9.6 CRITICAL On affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request ca
CVE-2024-27890 9.6 CRITICAL On affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request ca
CVE-2023-5502 5.9 MEDIUM On affected platforms running Arista EOS with 802.1x authentication configured on the acce
CVE-2024-27891 5.3 MEDIUM On affected platforms running Arista EOS with MACsec and egress ACLs configured on the sam
CVE-2024-6858 In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed acc

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-1286

V. Comments for CVE-2025-8873

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