What is CVE-2018-9940?

CVE-2018-9940 is a high-severity vulnerability in Foxit Reader, classified under Incorrect Type Conversion or Cast. CVSS score: 8.8/10. Published 2018-05-17.

How severe is CVE-2018-9940?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Foxit Reader

CVE-2018-9940

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 9.0.0.29935. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of the layout sheet attribute. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to execute code under the context of the current process. Was ZDI-CAN-5374.

Published 2018-05-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.032 · newest: 0.031 · change: -0.001

Affected products

Weakness classification (CWE)

CWE-704 — Incorrect Type Conversion or Cast

References

zerodayinitiative.com/advisories/ZDI-18-324 (VDB Entry, Third Party Advisory)
www.foxitsoftware.com/support/security-bulletins.php (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-9940?: CVE-2018-9940 is a high-severity vulnerability in Foxit Reader, classified under Incorrect Type Conversion or Cast. CVSS score: 8.8/10. Published 2018-05-17.
How severe is CVE-2018-9940?: High severity. CVSS v3 base score is 8.8 out of 10.