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CVE-2026-19641— On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legit

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4.36.0F版本、4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7.1M版本和4.33.8M及之前版本存在输出处理不当漏洞，该漏洞源于密码认证配置下，特制密码可创建孤儿认证会话，重复利用可耗尽可用认证资源，导致合法用户无法登录设备。

CVSS 5.3 · Medium EPSS 0.47% · P41

Possible ATT&CK Techniques 2 AI

T1562 T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Arista Networks EOS 4.36.0≤ 4.36.0F affected
4.35.0≤ 4.35.5M affected
4.34.0≤ 4.34.7.1M affected
0.0.0≤ 4.33.8M affected
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I. Basic Information for CVE-2026-19641

Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legit
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legitimate users being unable to log in to the device. 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:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Arista Networks EOS 输出处理不当漏洞
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4.36.0F版本、4.35.0版本至4.35.5M版本、4.34.0版本至4.34.7.1M版本和4.33.8M及之前版本存在输出处理不当漏洞，该漏洞源于密码认证配置下，特制密码可创建孤儿认证会话，重复利用可耗尽可用认证资源，导致合法用户无法登录设备。
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 ~ 4.36.0F -

II. Public POCs for CVE-2026-19641

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III. Intelligence Information for CVE-2026-19641

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Vendor Advisories for CVE-2026-19641 (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-2026-73451 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-116