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CVE-2026-73451— On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can

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 的受影响平台上，若配置了双交换引擎卡，并在共享模式下的交换虚拟接口（SVI）上启入了入方向安全访问控制列表（Security ACL），当重启备用交换引擎卡的前向代理（forwarding agent）或插入备用交换引擎卡时，可能导致共享 SVI 上的安全 ACL 失效。这可能会引起数据包放行/拒绝行为异常。 此问题由 Arista 内部发现，该公司目前未察觉客户网络中有任何恶意利用该漏洞的情况。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1578 · Modify Cloud Compute Infrastructure

Affected Version Matrix 6

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0≤ 4.36.0.1F affected
4.35.0≤ 4.35.4M affected
4.34.0≤ 4.34.6M affected
4.33.0≤ 4.33.8M affected
4.32.0≤ 4.32.11M affected
4.31.1F≤ 4.31.10M affected
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I. Basic Information for CVE-2026-73451

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1419
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.36.0 ~ 4.36.0.1F -

II. Public POCs for CVE-2026-73451

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III. Intelligence Information for CVE-2026-73451

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Vendor Advisories for CVE-2026-73451 (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-2026-19655 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-2026-73444 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-1419

V. Comments for CVE-2026-73451

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