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CVE-2026-73458— On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou

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 Networks EOS是美国Arista Networks公司的一款面向数据中心与云环境的高可编程网络设备操作系统。 Arista Networks EOS 4.36.0版本至4.36.1F版本、4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7M版本和4.33.0版本至4.33.8M版本存在授权问题漏洞，该漏洞源于在配置了认证的双向转发检测（BFD）会话时，特制数据包可导致BFD会话断开，可能因路由协议监控BFD会话状态而导致非预期网络变化。

CVSS 8.2 · High EPSS 0.40% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0≤ 4.36.1F affected
4.35.0≤ 4.35.5M affected
4.34.0≤ 4.34.7M affected
4.33.0≤ 4.33.8M affected
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I. Basic Information for CVE-2026-73458

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5
Vulnerability Title
Arista Networks EOS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arista Networks EOS是美国Arista Networks公司的一款面向数据中心与云环境的高可编程网络设备操作系统。 Arista Networks EOS 4.36.0版本至4.36.1F版本、4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7M版本和4.33.0版本至4.33.8M版本存在授权问题漏洞，该漏洞源于在配置了认证的双向转发检测（BFD）会话时，特制数据包可导致BFD会话断开，可能因路由协议监控BFD会话状态而导致非预期网络变化。
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 ~ 4.36.1F -

II. Public POCs for CVE-2026-73458

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III. Intelligence Information for CVE-2026-73458

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Vendor Advisories for CVE-2026-73458 (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-2026-73459 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-2026-73451 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-303