CVE-2026-19655

On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.

Score

CVSS 4.0 7.1 High

Status

Awaiting Analysis - psirt@arista.com

Published

2026-09-15

Last modified

2026-09-16

Weaknesses

CWE-20

Affected products

• Eos (Arista Networks)

References

• https://www.arista.com/en/support/advisories-notices/security-advisory/24711-security-advisory-0155