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CVE-2026-73440— Security Advisory 0178

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.

在配置了简单网络管理协议（SNMP）的受影响平台（运行 Arista EOS）上，SNMPv3 的本地或远程用户凭据可能以单向哈希化的本地密钥值形式，暴露于设备的运行配置及净化后的配置文件中。能够访问此类敏感信息的已认证用户，可能利用该信息对 SNMP 表执行未授权的读取操作，或向网络管理系统（NMS）发送伪造的陷阱（trap）通知。 该问题由 Arista 在内部发现，该公司目前未察觉其客户网络中存在针对此漏洞的恶意利用案例。

CVSS 4.2 · Medium EPSS 0.27% · P19

Affected Version Matrix 5

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0F≤ 4.36.1F affected
4.35.0F≤ 4.35.5M affected
4.34.0F≤ 4.34.7.1M affected
4.33.0F≤ 4.33.9M affected
1.0.0< 4.33.0F affected
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I. Basic Information for CVE-2026-73440

Vulnerability Information
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Vulnerability Title
Security Advisory 0178
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device's running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS). 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:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的不恰当跨边界移除
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.36.0F ~ 4.36.1F -

II. Public POCs for CVE-2026-73440

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III. Intelligence Information for CVE-2026-73440

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Other References for CVE-2026-73440 (1)

Same Patch Batch · Arista Networks · 2026-09-16 · 28 CVEs total

CVE-2026-73456 10.0 CRITICAL Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request
CVE-2026-73453 10.0 CRITICAL Security Advisory 0174
CVE-2026-86106 9.6 CRITICAL Security Advisory 0179
CVE-2026-73447 9.1 CRITICAL Security Advisory 0162 - gNSI Certz/Bootz OS Command Injection via Crafted Rotate Request
CVE-2026-73464 8.8 HIGH Security Advisory 0166
CVE-2026-73435 8.2 HIGH Security Advisory 0171
CVE-2026-73454 8.1 HIGH Security Advisory 0165
CVE-2026-86108 8.0 HIGH Security Advisory 0181
CVE-2026-73461 8.0 HIGH Security Advisory 0163
CVE-2026-73455 7.5 HIGH Security Advisory 0173
CVE-2026-73439 7.5 HIGH Security Advisory 0164
CVE-2026-2380 7.4 HIGH Security Advisory 0168
CVE-2026-73450 6.9 MEDIUM Security Advisory 0161
CVE-2026-86109 6.6 MEDIUM Security Advisory 0182
CVE-2026-73462 6.5 MEDIUM On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) sn
CVE-2026-77190 6.5 MEDIUM Security Advisory 0177
CVE-2026-73468 6.5 MEDIUM Security Advisory 0175
CVE-2026-73436 6.5 MEDIUM Security Advisory 0171
CVE-2026-86107 5.9 MEDIUM Security Advisory 0180
CVE-2026-73469 5.8 MEDIUM Security Advisory 0176

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-212