What’s Vulnerable › Vulnerabilities

CVE-2021-28495

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-09 · updated 2026-06-17
• Weakness: CWE-287

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

Affected products

• Arista Metamako Operating System: from 0.10.0 through 0.13.0; from 0.20.0 through 0.26.7; from 0.30.0 before 0.32.0 — fixed in 0.32.0

How to fix

Upgrade to a fixed version: Arista Metamako Operating System 0.32.0. Check the vendor advisory for mitigations.

References

• https://www.arista.com/en/support/advisories-notices/security-advisories/12914-security-advisory-66
• https://www.arista.com/en/support/advisories-notices/security-advisories/12914-security-advisory-66

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