Is CVE-2021-28495 actively exploited?

No active exploitation of CVE-2021-28495 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28495 be exploited remotely?

Yes. CVE-2021-28495 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-28495?

CVE-2021-28495 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-28495

CRITICAL

CVE-2021-28495

CWE-287Published: September 9, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, user authentication can be bypassed when API access is enabled via the JSON-RPC APIs. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.13 and post releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train

NVD Source

Technical Analysis

CVE-2021-28495 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.