Is CVE-2021-33793 actively exploited?

No active exploitation of CVE-2021-33793 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33793 be exploited remotely?

Yes. CVE-2021-33793 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-33793?

CVE-2021-33793 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-33793

CRITICAL

CVE-2021-33793

CWE-787Published: August 11, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Foxit Reader before 10.1.4 and PhantomPDF before 10.1.4 have an out-of-bounds write because the Cross-Reference table is mishandled during Office document conversion.

NVD Source

Technical Analysis

CVE-2021-33793 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.