7.5

CVE-2021-28504: arista networks eos Improper Access Control

CVSS: 7.5v3.1HighModified
Published 01-04-2022Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-28504 is a high (CVSS 7.5) Improper Access Control vulnerability in arista networks eos. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
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. 01-04-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

On Arista Strata family products which have “TCAM profile” feature enabled when Port IPv4 access-list has a rule which matches on “vxlan” as protocol then that rule and subsequent rules ( rules declared after it in ACL ) do not match on IP protocol field as expected.

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 18-09-2026

18-09-202618-10-2026
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≥ 4.26, < 4.26.4m | ≥ 4.27, < 4.27.1f
Arista networks1 product
  • eos≥ 4.26.3F, ≤ 4.26.0 | ≥ 4.27.0F, ≤ 4.27.0

2 vendors · 2 products

References

1 links