CVE-2021-28499

Name: CVE-2021-28499
Creator: NVD / NIST
Published: 2021-09-09T13:15:09.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.20%

Last modified Jun 17, 2026

CVE-2021-28499 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, user account passwords set in clear text could leak to users without any password. This issue affects: Arista Metamako Operating System MOS-0.18 and post releases in the MOS-0.1x train All releases in the MOS-0.2x train MOS-0.31.1 and prior releases in the MOS-0.3x train. EPSS estimates a 0.20% 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, user account passwords set in clear text could leak to users without any password. This issue affects: Arista Metamako Operating System MOS-0.18 and post releases in the MOS-0.1x train All releases in the MOS-0.2x train MOS-0.31.1 and prior releases in the MOS-0.3x train

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Arista	Metamako Operating System	>= 0.10.0, <= 0.18.0
Arista	Metamako Operating System	>= 0.20.0, < 0.32.0

References

https://www.arista.com/en/support/advisories-notices/security-advisories/12912-security-advisory-64Mitigation, Vendor Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12912-security-advisory-64Mitigation, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-28499?

How severe is CVE-2021-28499?

CVE-2021-28499 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28499?

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-2021-28499?

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

Scan your code now

Source: NVD / NIST