7.5

CVE-2021-28505: arista networks eos Improper Access Control

CVSS: 7.5v3.1HighModified
Published 14-04-2022Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-28505 is a high (CVSS 7.5) Improper Access Control vulnerability in arista networks eos. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.88%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 14-04-2022
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

0.00 pp

From 0.88% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.88%

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≥ 4.26, < 4.26.4m | ≥ 4.27, < 4.27.1f
Arista networks1 product
  • eos≥ 4.26.3M, ≤ 4.26.0 | ≥ 4.27.0F, ≤ 4.27.0

2 vendors · 2 products

References

1 links