What is CVE-2018-1000201?

CVE-2018-1000201 is a high-severity vulnerability in Microsoft Windows, classified under Untrusted Search Path. CVSS score: 7.8/10. Published 2018-06-22.

How severe is CVE-2018-1000201?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Windows

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 is used as DLL name instead of a String This vulnerability appears to have been fixed in v1.9.24 and later.

Published 2018-06-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.6th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.014 · change: -0.005

Affected products

Weakness classification (CWE)

CWE-426 — Untrusted Search Path

References

github.com/ffi/ffi/commit/e0fe486df0e117ed67b0282b6ada04b7214ca05c (Patch, Third Party Advisory)
github.com/ffi/ffi/commit/09e0c6076466b4383da7fa4e13f714311109945a (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000201?: CVE-2018-1000201 is a high-severity vulnerability in Microsoft Windows, classified under Untrusted Search Path. CVSS score: 7.8/10. Published 2018-06-22.
How severe is CVE-2018-1000201?: High severity. CVSS v3 base score is 7.8 out of 10.