9.1

CVE-2021-28500: arista networks arista eos Improper Authorization

CVSS: 9.1v3.1CriticalModified
Published 14-01-2022Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-28500 is a critical (CVSS 9.1) Improper Authorization vulnerability in arista networks arista eos. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 14-01-2022
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

0.00 pp

From 0.81% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.81%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (arista.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Arista1 product
  • eos< 4.20 | ≥ 4.21.0, ≤ 4.21.14m | ≥ 4.22.0, ≤ 4.22.11m | ≥ 4.23.0, ≤ 4.23.8m | ≥ 4.24.6.0, ≤ 4.24.6m | ≥ 4.25.0, ≤ 4.25.4m | ≥ 4.26.0, ≤ 4.26.1f
Arista networks1 product
  • arista eos≥ 4.26.1F, ≤ 4.26.0 | ≥ 4.25.4.M, ≤ 4.25.0 | ≥ 4.24.6M, ≤ 4.24.6.0 | ≥ 4.23.8M, ≤ 4.23.0 | ≥ 4.22.11M, ≤ 4.22.0 | ≥ 4.21.14M, ≤ 4.21.0 | ≥ 4.20 (No fix recorded)

2 vendors · 2 products

References

1 links