9.8

CVE-2021-28503: arista networks arista eos

CVSS: 9.8v3.1CriticalModified
Published 04-02-2022Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-28503 is a critical (CVSS 9.8) vulnerability in arista networks arista eos. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.6% 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
0.73%
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. 04-02-2022
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.73%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

0.00 pp

From 0.73% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.73%

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
  • eos≥ 4.22, ≤ 4.22.9m | ≥ 4.23, ≤ 4.23.9 | ≥ 4.24, ≤ 4.24.7 | ≥ 4.25, ≤ 4.25.5 | ≥ 4.26, ≤ 4.26.2
Arista networks1 product
  • arista eos≥ EOS-4.23, < EOS-4.23.10 | ≥ EOS-4.24, < EOS-4.24.8 | ≥ EOS-4.25, < EOS-4.25.6 | ≥ EOS-4.26, < EOS-4.26.3

2 vendors · 2 products

References

1 links