CVE-2021-28503 | BDVDB-2026-169147 Detail

Arista NetworksArista EOS

Description#

The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.

Impact#

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

Weaknesses#

CWE-305 Authentication Bypass by Primary Weakness

References#

https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072

Exploit#

No public exploit known

History#

Version 12022-02-04Record published in the CVE List.
Version 22024-09-16Most recent update recorded in the CVE List.

Published

Published: 2022-02-04
Last modified: 2024-09-16

Vendor information

Vendor: Arista Networks
Product: Arista EOS

All Arista Networks vulnerabilities

Score

7.4 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 54.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

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

Affected Systems

Vulnerable
>= EOS-4.23 and < EOS-4.23.10
Fixed
EOS-4.23.10
Vulnerable
>= EOS-4.24 and < EOS-4.24.8
Fixed
EOS-4.24.8
Vulnerable
>= EOS-4.25 and < EOS-4.25.6
Fixed
EOS-4.25.6
Vulnerable
>= EOS-4.26 and < EOS-4.26.3
Fixed
EOS-4.26.3

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.4 High

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

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

CVSS v3.0

Not available

CVSS v2

Not available

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