CVE-2021-28493

Name: CVE-2021-28493
Creator: NVD / NIST
Published: 2021-09-09T13:15:08.63+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2021-28493 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, a user may be able to execute commands despite not having the privileges to do so. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.32.0 and prior releases. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, a user may be able to execute commands despite not having the privileges to do so. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.32.0 and prior releases

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.21%

11.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Arista	Metamako Operating System	<= 0.32.0

References

https://www.arista.com/en/support/advisories-notices/security-advisories/12915-security-advisory-67Mitigation, Vendor Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12915-security-advisory-67Mitigation, Vendor Advisory

Timeline

Published: Sep 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28493?

How severe is CVE-2021-28493?

CVE-2021-28493 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28493?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28493?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST