CVE-2021-28503: In Arista's EOS software affected releases, eAPI might skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.
First published: Fri Feb 04 2022(Updated: )
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.
Credit: psirt@arista.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Arista EOS | >=4.22<=4.22.9m | |
| Arista EOS | >=4.23<=4.23.9 | |
| Arista EOS | >=4.24<=4.24.7 | |
| Arista EOS | >=4.25<=4.25.5 | |
| Arista EOS | >=4.26<=4.26.2 |
Remedy
The recommended resolution is to upgrade to a remediated software version at your earliest convenience. The vulnerability is fixed in the following EOS versions: 4.26.3 and later releases in the 4.26.x train 4.25.6 and later releases in the 4.25.x train 4.24.8 and later releases in the 4.24.x train 4.23.10 and later releases in the 4.24.x train
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Reference Links
Frequently Asked Questions
What is CVE-2021-28503?
CVE-2021-28503 is a vulnerability in Arista's EOS eAPI that allows remote attackers to access the device via eAPI.
What is the impact of CVE-2021-28503?
The impact of CVE-2021-28503 is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate-based authentication is used.
How can remote attackers exploit CVE-2021-28503?
Remote attackers can exploit CVE-2021-28503 to access the device via eAPI.
What is the severity of CVE-2021-28503?
CVE-2021-28503 has a severity rating of 9.8 (critical).
How can I fix CVE-2021-28503?
To fix CVE-2021-28503, update Arista's EOS to version 4.22.9m, 4.23.9, 4.24.7, 4.25.5, or 4.26.2.
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- agent/weakness
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/title
- agent/author
- agent/last-modified-date
- agent/remedy
- agent/references
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/arista
- canonical/arista eos
- version/arista eos/4.22
- version/arista eos/4.22.9m
- version/arista eos/4.23
- version/arista eos/4.23.9
- version/arista eos/4.24
- version/arista eos/4.24.7
- version/arista eos/4.25
- version/arista eos/4.25.5
- version/arista eos/4.26
- version/arista eos/4.26.2