How severe is CVE-2018-21239?

CVE-2018-21239 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2018-21239 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21239?

CVE-2018-21239 primarily affects Foxitsoftware Phantompdf. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-21239?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-21239 published?

CVE-2018-21239 was published on 2020-06-04 and last updated on 2026-06-17.

CVE-2018-21239

CVE-2018-21239 is a medium-severity vulnerability in Foxitsoftware Phantompdf with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Foxitsoftware Phantompdf
Published: 2020-06-04
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2018-21239?: CVE-2018-21239 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2018-21239 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21239?: CVE-2018-21239 primarily affects Foxitsoftware Phantompdf. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-21239?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-21239 published?: CVE-2018-21239 was published on 2020-06-04 and last updated on 2026-06-17.

References

https://www.foxitsoftware.com/support/security-bulletins.php

Affected products (2)

cpe:2.3:a:foxitsoftware:phantompdf:*:*:*:*:*:*:*:*
cpe:2.3:a:foxitsoftware:reader:*:*:*:*:*:*:*:*

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