What’s Vulnerable › Vulnerabilities

CVE-2018-5255

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-05 · updated 2026-06-17

Description

The Mlag agent in Arista EOS 4.19 before 4.19.4M and 4.20 before 4.20.2F allows remote attackers to cause a denial of service (agent restart) via crafted UDP packets.

Affected products

• Arista Networks EOS: from 4.19 before 4.19.4m; from 4.20 before 4.20.2f — fixed in 4.19.4m, 4.20.2f

How to fix

Upgrade to a fixed version: Arista Networks EOS 4.19.4m, 4.20.2f. Check the vendor advisory for mitigations.

References

• https://www.arista.com/en/support/advisories-notices/security-advisories/4347-security-advisory-32
• https://www.arista.com/en/support/advisories-notices/security-advisories/4347-security-advisory-32

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