CVE-2026-19640

Security Advisory 0170

MEDIUM

4.2

CVSS Score

Published: September 16, 2026 at 09:11 AM UTC

Updated: September 16, 2026 at 07:24 PM UTC

1 product affected across 1 vendorArista EOS

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Severity

MEDIUM4.2

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Arista EOS · Arista Networks

60%

4.24.0F ≤ v < 4.33.0F4.33.0F ≤ v ≤ 4.33.8M4.34.0F ≤ v ≤ 4.34.7M4.35.0F ≤ v ≤ 4.35.5M4.36.0F ≤ v ≤ 4.36.0.1F4.24.0F 4.33.0F 4.34.0F 4.35.0F 4.36.0F

Affected range stops below 4.33.0F, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.arista.com/en/support/advisories-notices/security-advisory/24726-security-advisory-0170

References (1)

Vendor Advisory

Source: cverecord

https://www.arista.com/en/support/advisories-notices/security-advisory/24726-security-advisory-0170

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.2MEDIUMArista

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-863

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