CVE-2018-1000201: ruby-ffi version 1.9.23 and earlier has a DLL loading issue which can be hijacked on Windows OS, when a Symbol

Q: How do I fix CVE-2018-1000201?

ruby-ffi: upgrade to newer than 1.9.23. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000201 being exploited?

CVE-2018-1000201 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000201 affect?

CVE-2018-1000201 affects ruby-ffi. Severity is high (CVSS 7.8). ruby-ffi version 1.9.23 and earlier has a DLL loading issue which can be hijacked on Windows OS, when a Symbol is used as DLL name instead of a String This vulnerability appears to have been fixed in v1.9.24 and later.

This month

HIGH 7.8UPGRADE

CVE-2018-1000201 is a high-severity flaw (CVSS 7.8) affecting ruby-ffi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ruby-ffi version 1.9.23 and earlier has a DLL loading issue which can be hijacked on Windows OS, when a Symbol is used as DLL name instead of a String This vulnerability appears to have been fixed in v1.9.24 and later.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-426
Published	2018-06-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ruby-ffi project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-06-22 18:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

ruby-ffi project ruby-ffi UPGRADE

Affected: <= 1.9.23

Fixed in: newer than 1.9.23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ruby-ffi || rpm -q ruby-ffi || ruby-ffi --version

2. UPGRADE to newer than 1.9.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ruby-ffi

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ruby-ffi

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1000201?

ruby-ffi: upgrade to newer than 1.9.23. Exact commands for each OS are on this page.

Is CVE-2018-1000201 being exploited?

CVE-2018-1000201 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1000201 affect?

CVE-2018-1000201 affects ruby-ffi. Severity is high (CVSS 7.8). ruby-ffi version 1.9.23 and earlier has a DLL loading issue which can be hijacked on Windows OS, when a Symbol is used as DLL name instead of a String This vulnerability appears to have been fixed in v1.9.24 and later.

How urgent is CVE-2018-1000201?

Priority 45/100. High severity

Software pages

Windows vulnerabilities · Ruby vulnerabilities

References

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