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CVE Record

CVE-2017-18190: A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows r...

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).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2017-18190 is a CUPS printing-service weakness where a trusted hostname entry could be abused through DNS rebinding. An attacker could make the CUPS daemon accept remote POST requests as if they were local and run arbitrary IPP commands. No active exploitation is cited in the supplied sources.

Executive priority

Treat as a targeted infrastructure hardening item, not an emergency based on the supplied evidence. Prioritize internet-exposed or broadly reachable print services and older desktop/server fleets.

Technical view

CUPS before 2.2.2 allowed localhost.localdomain in valid_host() in scheduler/client.c. Because that name can be resolved by DNS rather than guaranteed locally, DNS rebinding could bypass host validation and permit arbitrary IPP commands against cupsd via POST requests.

Likely exposure

Systems running CUPS versions before 2.2.2 are the primary concern, especially desktops, print servers, and Linux/Unix hosts where cupsd is reachable from browsers or untrusted networks.

Exploitation context

The supplied record describes remote attack via DNS rebinding and POST requests to the CUPS daemon. CISA KEV is false, and the provided sources do not state active exploitation in the wild.

Researcher notes

The key issue is hostname trust, not browser enforcement: localhost.localdomain was not guaranteed to resolve to 127.0.0.1. Public metadata lacks CVSS, CWE, and detailed affected CPEs, so validation should rely on CUPS version and vendor package status.

Mitigation direction

  • Upgrade CUPS to 2.2.2 or a vendor package containing the fix.
  • Apply relevant Ubuntu or Debian security updates where those distributions are used.
  • Restrict cupsd access to trusted interfaces and networks.
  • Review vendor guidance for any distro-specific backported fixes.
  • Avoid exposing CUPS administrative endpoints to untrusted networks.

Validation and detection

  • Inventory hosts running CUPS and record package versions.
  • Confirm whether installed packages include the CVE-2017-18190 fix.
  • Check cupsd listener exposure and allowed network sources.
  • Review CUPS configuration for unnecessary remote administration access.
  • Confirm security advisories are applied on Ubuntu and Debian systems.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2017-18190 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.