CVE-2021-33794: Foxit Reader before 10.1.4 and PhantomPDF before 10.1.4 allow information disclosure or an application crash a

Q: How do I fix CVE-2021-33794?

foxit reader: upgrade to 10.1.4; phantompdf: upgrade to 10.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2021-33794 being exploited?

CVE-2021-33794 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-2021-33794 affect?

CVE-2021-33794 affects foxit reader, phantompdf. Severity is critical (CVSS 9.1). Foxit Reader before 10.1.4 and PhantomPDF before 10.1.4 allow information disclosure or an application crash after mishandling the Tab key during XFA form interaction.

Q: How urgent is CVE-2021-33794?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2021-33794 is a critical-severity flaw (CVSS 9.1) affecting foxit reader, phantompdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Foxit Reader before 10.1.4 and PhantomPDF before 10.1.4 allow information disclosure or an application crash after mishandling the Tab key during XFA form interaction.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
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 20:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

foxitsoftware foxit reader UPGRADE

Affected: < 10.1.4

Fixed in: 10.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.1.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade foxit-reader

Note

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

foxitsoftware phantompdf UPGRADE

Affected: < 10.1.4

Fixed in: 10.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy phantompdf || rpm -q phantompdf || phantompdf --version

2. UPGRADE to 10.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade phantompdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phantompdf

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-2021-33794?

foxit reader: upgrade to 10.1.4; phantompdf: upgrade to 10.1.4. Exact commands for each OS are on this page.

Is CVE-2021-33794 being exploited?

CVE-2021-33794 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-2021-33794 affect?

CVE-2021-33794 affects foxit reader, phantompdf. Severity is critical (CVSS 9.1). Foxit Reader before 10.1.4 and PhantomPDF before 10.1.4 allow information disclosure or an application crash after mishandling the Tab key during XFA form interaction.

How urgent is CVE-2021-33794?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-43310 HIGH 7.8 UPGRADE An Uncontrolled Search Path Element in Foxit Software released Foxit Reader v11.2.118.51569 allows attackers t
CVE-2021-38574 CRITICAL 9.8 UPGRADE UPGRADE An issue was discovered in Foxit Reader and PhantomPDF before 10.1.4
CVE-2021-38573 CRITICAL 9.8 UPGRADE UPGRADE An issue was discovered in Foxit Reader and PhantomPDF before 10.1.4
CVE-2021-38572 CRITICAL 9.8 UPGRADE UPGRADE An issue was discovered in Foxit Reader and PhantomPDF before 10.1.4
CVE-2021-38571 HIGH 7.8 UPGRADE UPGRADE An issue was discovered in Foxit Reader and PhantomPDF before 10.1.4

References

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