CVE-2021-28495

CRITICAL

9.8

CVSS Score

Published: September 9, 2021 at 12:43 PM UTC

Updated: June 17, 2026 at 03:46 AM UTC

2 products affected across 1 vendorMetamako Operating System7130

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Severity

CRITICAL9.8

Exploit prediction

EPSS 0.9%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Metamako Operating System · Arista

95%

v < MOS-0.26.7v < MOS-0.32.00.10.0 ≤ v ≤ 0.13.00.20.0 ≤ v ≤ 0.26.70.30.0 ≤ v < 0.32.0MOS-0.13 ≤ v < MOS-0.13*MOS-0.13

Affected range stops below 0.32.0, so it looks safe — our inference, not a vendor statement

Affected range stops below MOS-0.13*, so it looks safe — our inference, not a vendor statement

Affected range stops below MOS-0.26.7, so it looks safe — our inference, not a vendor statement

Affected range stops below MOS-0.32.0, so it looks safe — our inference, not a vendor statement

arista-7130 (environment)

7130 · Aristadevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_MISCMitigationVendor Advisory

Source: [email protected]

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

CVSS

9.8CRITICAL[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287

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