How severe is CVE-2021-38566?

CVE-2021-38566 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-38566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38566?

CVE-2021-38566 primarily affects Foxitsoftware Pdf Editor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-38566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38566 published?

CVE-2021-38566 was published on 2021-08-11 and last updated on 2026-06-17.

CVE-2021-38566

CVE-2021-38566 is a high-severity vulnerability in Foxitsoftware Pdf Editor with a CVSS 3.x base score of 7.5. 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-674.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-674
Affected product: Foxitsoftware Pdf Editor
Published: 2021-08-11
Last modified: 2026-06-17

Description

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It allows stack consumption during recursive processing of embedded XML nodes.

Frequently asked questions

What is CVE-2021-38566?: An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It allows stack consumption during recursive processing of embedded XML nodes.
How severe is CVE-2021-38566?: CVE-2021-38566 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-38566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38566?: CVE-2021-38566 primarily affects Foxitsoftware Pdf Editor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-38566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38566 published?: CVE-2021-38566 was published on 2021-08-11 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:foxitsoftware:pdf_editor:*:*:*:*:*:*:*:*
cpe:2.3:a:foxitsoftware:pdf_reader:*:*:*:*:*:*:*:*

More vulnerabilities in Foxitsoftware Pdf Editor

CVE-2021-38563 — Critical (CVSS 9.8): An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in…
CVE-2021-38564 — Critical (CVSS 9.1): An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It allows an out-of-bounds read…
CVE-2021-34853 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader…
CVE-2021-34852 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader…
CVE-2021-34851 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader…
CVE-2021-34850 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader…

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