CVE-2021-38566: An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1

Q: How do I fix CVE-2021-38566?

pdf editor: upgrade to 11.0.1; pdf reader: upgrade to 11.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-38566 being exploited?

CVE-2021-38566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-38566 affect?

CVE-2021-38566 affects pdf editor, pdf reader. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2021-38566?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2021-38566 is a high-severity flaw (CVSS 7.5) affecting pdf editor, pdf reader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-674
Published	2021-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: foxitsoftware

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-11 22:15 UTCPublished CVE record published
2026-06-17 04:02 UTCUpdated Record last modified

foxitsoftware pdf editor UPGRADE

Affected: < 11.0.1

Fixed in: 11.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pdf-editor || rpm -q pdf-editor || pdf-editor --version

2. UPGRADE to 11.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pdf-editor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pdf-editor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

foxitsoftware pdf reader UPGRADE

Affected: < 11.0.1

Fixed in: 11.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pdf-reader || rpm -q pdf-reader || pdf-reader --version

2. UPGRADE to 11.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pdf-reader

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pdf-reader

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-38566?

pdf editor: upgrade to 11.0.1; pdf reader: upgrade to 11.0.1. Exact commands for each OS are on this page.

Is CVE-2021-38566 being exploited?

CVE-2021-38566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-38566 affect?

CVE-2021-38566 affects pdf editor, pdf reader. Severity is high (CVSS 7.5). 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 urgent is CVE-2021-38566?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

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CVE-2026-91814 MEDIUM 5.3 UPGRADE UPGRADE A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF
CVE-2026-91798 HIGH 8.8 UPGRADE UPGRADE A local privilege escalation vulnerability exists in the update daemon of Foxit PDF Editor/Reader due to an in
CVE-2026-91794 HIGH 7.8 UPGRADE UPGRADE An out-of-bounds write vulnerability exists in the PDF rendering process of Foxit PDF Editor/Reader due to ins
CVE-2026-91788 MEDIUM 4.7 UPGRADE UPGRADE When implementing the JavaScript interface, Foxit PDF Editor/Reader did not perform the attribute authorizatio
CVE-2026-5941 HIGH 7.8 UPGRADE UPGRADE Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed

References

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