CVE detail

CVE-2021-28495 — CVE-2021-28495

Published 2021-09-09 · Modified 2026-06-17 · Vendor arista · Product metamako_operating_system · Source nvd

HIGH

severity

CVSS-derived band

7.2

CVSS v3

0–10 scale

0.0093

EPSS probability

exploitation probability, 30d

57.0%

EPSS percentile

percentile vs all CVEs

NOT LISTED

CISA KEV

known exploited catalog

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

Remediation

vendor remediation guidance

Upgrade to MOS-0.26.7 or MOS-0.32.0 Install hotfix stored at https://www.arista.com/assets/data/SecurityAdvisories/SA64-67/SecurityAdvisory64-67-Hotfix-mos-1818-2.0.0-1.11.core2_64.rpm For detailed information about hotfix installation, please see the advisory https://www.arista.com/en/support/advisories-notices/security-advisories/12912-security-advisory-64

Product	Vulnerable range	Fixed version	Advisory
Arista Metamako Operating System	>=MOS-0.13<MOS-0.13*	MOS-0.13*	advisory ↗
Arista Metamako Operating System	>=MOS-0.26.7<MOS-0.26.7	MOS-0.26.7	advisory ↗
Arista Metamako Operating System	>=MOS-0.32.0<MOS-0.32.0	MOS-0.32.0	advisory ↗

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.