CVE-2026-19640 | BDVDB-2026-374689 Detail

Arista NetworksEOS

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-863 Incorrect Authorization

References#

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

Exploit#

No public exploit known

History#

Version 12026-09-16Record published in the CVE List.

Published

Published: 2026-09-16
Last modified: 2026-09-16

Vendor information

Vendor: Arista Networks
Product: EOS

All Arista Networks vulnerabilities

Score

4.2 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 10.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Incorrect Authorization

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 4.36.0F and <= 4.36.0.1F
Fixed
Not stated
Vulnerable
>= 4.35.0F and <= 4.35.5M
Fixed
Not stated
Vulnerable
>= 4.34.0F and <= 4.34.7M
Fixed
Not stated
Vulnerable
>= 4.33.0F and <= 4.33.8M
Fixed
Not stated
Vulnerable
>= 4.24.0F and < 4.33.0F
Fixed
4.33.0F

Scoring System

CVSS v4.0

2.3 Low

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	Low
User Interaction	None
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	Low
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

4.2 Medium

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).