CVE-2017-17790

Name: CVE-2017-17790
Creator: NVD / NIST
Published: 2017-12-20T09:29:01.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 5.91%

Last modified Jun 17, 2026

CVE-2017-17790 is a vulnerability of currently unknown severity. The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input may be highly unlikely.. EPSS estimates a 5.91% chance of exploitation in the next 30 days.

Description

The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input may be highly unlikely.

Metrics

EPSS Probability

5.91%

92.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions	Update
Ruby-Lang	Ruby	>= 2.2, <= 2.2.8	—
Ruby-Lang	Ruby	>= 2.3, <= 2.3.5	—
Ruby-Lang	Ruby	>= 2.4, <= 2.4.2	—
Ruby-Lang	Ruby	2.5.0	Preview1

References

Timeline

Published: Dec 20, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-17790?

How severe is CVE-2017-17790?

Severity scoring for CVE-2017-17790 is pending analysis. The EPSS model estimates a 5.91% probability of exploitation in the next 30 days.

How do I fix CVE-2017-17790?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-17790?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST