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Vulnerability record · CVE-2017-18190 · published 16 February 2018

CVE-2017-18190: Apple cups authentication bypass by spoofing vulnerability

Apple · Cups

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).

7.5 CVSS 3.0 High EPSS 2.9% · top 13.5% CWE-290 · Authentication bypass by spoofing
7.5CVSS 3.0 base score, v2 5.0
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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).

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.chromium.org/p/project-zero/issues/detail?id=1048 ExploitIssue TrackingThird Party Advisory
https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3577-1/ Third Party Advisory
https://bugs.chromium.org/p/project-zero/issues/detail?id=1048 ExploitIssue TrackingThird Party Advisory
https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3577-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-18190), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.