9.8

CVE-2021-28495: arista metamako_operating_system Improper Authentication

CVSS: 9.8v3.1CriticalModified
Published 09-09-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-28495 is a critical (CVSS 9.8) Improper Authentication vulnerability in arista metamako_operating_system. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 59.9% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.93%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-09-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.93%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

0.00 pp

From 0.93% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.93%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Arista1 product
  • metamako_operating_system≥ MOS-0.13, < MOS-0.13* | ≥ MOS-0.26.7, < MOS-0.26.7 | ≥ MOS-0.32.0, < MOS-0.32.0 | ≥ 0.10.0, ≤ 0.13.0 | ≥ 0.20.0, ≤ 0.26.7 | ≥ 0.30.0, < 0.32.0

1 vendor · 1 product

References

1 links