What is CVE-2017-12939?

CVE-2017-12939 is a critical-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2017-08-18.

How severe is CVE-2017-12939?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Microsoft Windows

CVE-2017-12939

A Remote Code Execution vulnerability was identified in all Windows versions of Unity Editor, e.g., before 5.3.8p2, 5.4.x before 5.4.5p5, 5.5.x before 5.5.4p3, 5.6.x before 5.6.3p1, and 2017.x before 2017.1.0p4.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-08-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.047 (91.6th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.047 · newest: 0.047 · change: 0.000

Affected products

Microsoft Windows
Unity3d Unity Editor — versions 5.3.8, 5.4.0, 5.4.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securityfocus.com/bid/100444 (VDB Entry, Third Party Advisory, vdb-entry)
unity3d.com/security (Patch, Vendor Advisory)
twitter.com/0x09AL/status/898635999185711108

Frequently asked questions

What is CVE-2017-12939?: CVE-2017-12939 is a critical-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2017-08-18.
How severe is CVE-2017-12939?: Critical severity. CVSS v3 base score is 9.8 out of 10.