CVE-2021-28500
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.
02 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.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.81% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 56.5% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2022-01-14 19:11Z4 YR AGO
- Last updated
- 2024-09-16 18:44Z2 YR AGO
- Reserved
- 2021-03-16
- Assigning CNA
- Arista
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.1)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Weaknesses
- CWE-285Improper AuthorizationClass
- Data version
- 5.1
- Document digest
- 90e137547d4e9eeb5246df743fc0d43bf0c6c0c0c3c9f0fc9d6548e9ac8e3d4f
05 Affected products
06 References
07 Remediation
The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Artista recommends customers move to the latest version of each release that contains all the fixes listed below. CVE-2021-28500 has been fixed in the following releases: 4.26.2F and later releases in the 4.26.x train 4.25.5M and later releases in the 4.25.x train 4.25.4.1M and later releases in the 4.25.4.x train 4.24.7M and later releases in the 4.24.x train 4.23.9M and later releases in the 4.23.x train 4.22.12M and later releases in the 4.22.x train 4.21.15M and later releases in the 4.21.x train