How severe is CVE-2021-38564?

CVE-2021-38564 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2021-38564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38564?

CVE-2021-38564 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-2021-38564?

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

When was CVE-2021-38564 published?

CVE-2021-38564 was published on 2021-08-11 and last updated on 2026-06-17.

CVE-2021-38564

CVE-2021-38564 is a critical-severity vulnerability in Foxitsoftware Pdf Editor with a CVSS 3.x base score of 9.1. 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-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
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 an out-of-bounds read via util.scand.

Frequently asked questions

What is CVE-2021-38564?: 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 via util.scand.
How severe is CVE-2021-38564?: CVE-2021-38564 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2021-38564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38564?: CVE-2021-38564 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-2021-38564?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-38564 published?: CVE-2021-38564 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-2021-34853 — 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…
CVE-2021-34849 — High (CVSS 7.8): This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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