CVE-2017-18190: Apple Cups

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).

Affected products

• Apple Cups: before 2.2.2 (fixed in 2.2.2)
• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only
• Debian Debian Linux: version 7.0 only; version 8.0 only

Published 2018-02-16. Last modified 2026-06-17.