What’s Vulnerable › Vulnerabilities

CVE-2020-17355

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-21 · updated 2026-06-17

Description

Arista EOS before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F allows remote attackers to cause a denial of service (restart of agents) by crafting a malformed DHCP packet which leads to an incorrect route being installed.

Affected products

• Arista Networks EOS: from 4.21.0 before 4.21.12m; from 4.22 before 4.22.7m; from 4.23 before 4.23.5m; from 4.24.0 before 4.24.2f — fixed in 4.21.12m, 4.22.7m, 4.23.5m, 4.24.2f

How to fix

Upgrade to a fixed version: Arista Networks EOS 4.21.12m, 4.22.7m, 4.23.5m, 4.24.2f. Check the vendor advisory for mitigations.

References

• https://www.arista.com/en/support/advisories-notices/security-advisories/11759-security-advisory-53
• https://www.arista.com/en/support/advisories-notices/security-advisories/11759-security-advisory-53

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