CVE-2021-28503 json
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.
published 2022-02-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-15179
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 54%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Arista Networks Arista EOS EOS-4.23.10, EOS-4.24.8, EOS-4.25.6, EOS-4.26.3
Exploit prediction
0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Arista Networks Arista EOS
Classification
References
-
arista.com
/en/support/advisories-notices/security-advisories/13605-security-advisory-0072
mitigation, patch, vendor-advisory
Sources
- CVE List CVE-2021-28503
- NVD CVE-2021-28503
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