CVE-2021-28500

An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

HIGH
7.8
CVSS Score
Published: January 14, 2022 at 07:11 PM UTC
Updated: June 17, 2026 at 03:46 AM UTC
2 products affected across 2 vendorsEosArista EOS

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Severity
HIGH7.8
Exploit prediction
EPSS 0.8%

Description

An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

Affected

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

v < 4.204.21.0 ≤ v ≤ 4.21.14m4.22.0 ≤ v ≤ 4.22.11m4.23.0 ≤ v ≤ 4.23.8m4.24.6.0 ≤ v ≤ 4.24.6m4.25.0 ≤ v ≤ 4.25.4m4.26.0 ≤ v ≤ 4.26.1f
Affected range stops below 4.20, so it looks safe — our inference, not a vendor statement
v ≥ 4.204.21.14M ≤ v ≤ 4.21.04.22.11M ≤ v ≤ 4.22.04.23.8M ≤ v ≤ 4.23.04.24.6M ≤ v ≤ 4.24.6.04.25.4.M ≤ v ≤ 4.25.04.26.1F ≤ v ≤ 4.26.04.204.21.14M4.22.11M4.23.8M4.24.6M4.25.4.M4.26.1F

Remediation

No guide yet

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

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-285NVD-CWE-Other

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