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TI-2021-09603 Aliases CVE-2021-28495GHSA-cpvp-q5mv-cx2q

Improper authentication in Arista Metamako Operating System

Priority MEDIUM 44CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

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

Why it matters now

EPSS 0.0093 60th percentileScored 2026-11-08
Fix Fixed Metamako Operating System (Arista): MOS-0.26.7, MOS-0.32.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AristaMetamako Operating SystemMOS-0.13 and later; MOS-0.26.7 to before MOS-0.26.7; MOS-0.32.0 to before MOS-0.32.0MOS-0.26.7, MOS-0.32.0Patch availableCNA
  • Metamako Operating System VendorArista Affected MOS-0.13 and later; MOS-0.26.7 to before MOS-0.26.7; MOS-0.32.0 to before MOS-0.32.0 Fixed in MOS-0.26.7, MOS-0.32.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:arista:metamako_operating_system:*:*:*:*:*:*:*:*0.10.0 – 0.13.0; 0.20.0 – 0.26.7; 0.30.0 to before 0.32.0VulnerableArista
cpe:2.3:h:arista:7130:-:*:*:*:*:*:*:*not specified by NVDRunning onArista
  • cpe:2.3:o:arista:metamako_operating_system:*:*:*:*:*:*:*:* Versions 0.10.0 – 0.13.0; 0.20.0 – 0.26.7; 0.30.0 to before 0.32.0 Vulnerable ·Arista
  • cpe:2.3:h:arista:7130:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Arista

Remediation

  • Fix · CNA Metamako Operating System (Arista) Fixed in MOS-0.26.7, MOS-0.32.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Arista Metamako Operating System MOS-0.13*, MOS-0.26.7, MOS-0.32.0

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2021-09606 Credentials management flaw in Arista Metamako Operating SystemPriority LOW 37
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28495
  2. 2026-10-03 Alias added: GHSA-cpvp-q5mv-cx2q

References

Advisory 1

  • TI-2021-09602 Improper authentication in Arista Metamako Operating System CVSS 3.1CRITICAL 9.6
  • TI-2021-09606 Credentials management flaw in Arista Metamako Operating System CVSS 3.1HIGH 8.7
  • TI-2021-09601 Improper authentication in Arista Metamako Operating System CVSS 3.1HIGH 8.4
  • TI-2021-09605 Access control flaw in Arista Metamako Operating System CVSS 3.1HIGH 7.8
  • TI-2021-09607 Credentials management flaw in Arista Metamako Operating System CVSS 3.1MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences