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.
在受影响的平台中，如果 Arista EOS 配置了基于密码的认证机制，攻击者可以通过发送特别构造的密码来创建孤立的认证会话。若此问题被反复利用，将耗尽可用的认证资源，导致合法用户无法登录设备。 该问题由 Arista 内部发现，公司目前尚未发现客户网络中存在针对此漏洞的恶意利用案例。
Affected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Arista Networks | EOS | 4.36.0 ~ 4.36.0F | - |
|
II. Public POCs for CVE-2026-19641
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
V. Comments for CVE-2026-19641
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