What’s Vulnerable › Vulnerabilities

CVE-2017-18190

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-02-16 · updated 2026-06-17
• Weakness: CWE-290

Description

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

• cups: before 2.2.2 — fixed in 2.2.2
• Canonical Ubuntu Linux: 14.04, 16.04
• Debian Linux: 7.0, 8.0

How to fix

Upgrade to a fixed version: cups 2.2.2. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/project-zero/issues/detail?id=1048
• https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41
• https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html
• https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html
• https://usn.ubuntu.com/3577-1/
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1048
• https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41
• https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html
• https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html
• https://usn.ubuntu.com/3577-1/

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