What is CVE-2018-21239?

CVE-2018-21239 is a medium-severity vulnerability in Foxitsoftware Phantompdf, classified under Insufficiently Protected Credentials. CVSS score: 5.3/10. Published 2020-06-04.

How severe is CVE-2018-21239?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Foxitsoftware Phantompdf

CVE-2018-21239

An issue was discovered in Foxit Reader and PhantomPDF before 9.2. It allows NTLM credential theft via a GoToE or GoToR action.

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

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

Frequently asked questions

What is CVE-2018-21239?: CVE-2018-21239 is a medium-severity vulnerability in Foxitsoftware Phantompdf, classified under Insufficiently Protected Credentials. CVSS score: 5.3/10. Published 2020-06-04.
How severe is CVE-2018-21239?: Medium severity. CVSS v3 base score is 5.3 out of 10.