What is CVE-2018-21243?

CVE-2018-21243 is a medium-severity vulnerability in Foxitsoftware Phantompdf, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.5/10. Published 2020-06-04.

How severe is CVE-2018-21243?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Arbitrary file upload in Foxitsoftware Phantompdf

CVE-2018-21243

An issue was discovered in Foxit PhantomPDF before 8.3.6. It has COM object mishandling when Microsoft Word is used.

Vulnerability class: Unrestricted File Upload

Published 2020-06-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Foxitsoftware Phantompdf

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.foxitsoftware.com/support/security-bulletins.php (Vendor Advisory)

Frequently asked questions

What is CVE-2018-21243?: CVE-2018-21243 is a medium-severity vulnerability in Foxitsoftware Phantompdf, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.5/10. Published 2020-06-04.
How severe is CVE-2018-21243?: Medium severity. CVSS v3 base score is 6.5 out of 10.