CVE-2021-31702: Frontiersoftware Ichris

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Frontier ichris through 5.18 mishandles making a DNS request for the hostname in the HTTP Host header, as demonstrated by submitting 127.0.0.1 multiple times for DoS.

Affected products

• Frontiersoftware Ichris: up to and including 5.18

Published 2021-05-29. Last modified 2026-06-17.