7.1

CVE-2021-28507: arista networks eos Improper Access Control

CVSS: 7.1v3.1HighModified
Published 14-01-2022Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-28507 is a high (CVSS 7.1) Improper Access Control vulnerability in arista networks eos. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
39/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (NVD)
EPSS score
0.67%
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. 17-09-2024
    Last modifiedVulnerability information updated.

Description

An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.67%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

0.00 pp

From 0.67% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.67%

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≥ 4.23.0, ≤ 4.23.9m | ≥ 4.24.0, ≤ 4.24.7m | ≥ 4.25.0, ≤ 4.25.3 | ≥ 4.25.4, ≤ 4.25.4m | ≥ 4.25.5, ≤ 4.25.5.1m | ≥ 4.26.0, ≤ 4.26.2f | 4.21.0f | 4.21.1f | 4.21.3f | 4.22.0f | 4.22.1f
Arista networks1 product
  • eos≥ 4.22.0, < 4.23.0 | ≥ 4.26.2F, ≤ 4.26.0 | ≥ 4.25.5.1M, ≤ 4.25.5 | ≥ 4.25.4M, ≤ 4.25.4 | ≥ 4.25.3, ≤ 4.25.0 | ≥ 4.24.7M, ≤ 4.24.0 | ≥ 4.23.9M, ≤ 4.23.0 | 4.21.x

2 vendors · 2 products

References

1 links