What’s Vulnerable › Vulnerabilities

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.

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-04 · updated 2026-06-17
• Weakness: CWE-305

Description

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.

Affected products

• Arista Networks EOS: from 4.22 through 4.22.9m; from 4.23 through 4.23.9; from 4.24 through 4.24.7; from 4.25 through 4.25.5; from 4.26 through 4.26.2

References

• https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072
• https://www.arista.com/en/support/advisories-notices/security-advisories/13605-security-advisory-0072

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