Is CVE-2021-38563 actively exploited?

No active exploitation of CVE-2021-38563 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-38563 be exploited remotely?

Yes. CVE-2021-38563 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-38563?

CVE-2021-38563 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-38563

CRITICAL

CVE-2021-38563

CWE-129Published: August 11, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size (derived from a /Size entry) is smaller than the maximum indirect object number, and thus there is an attempted incorrect array access (leading to a NULL pointer dereference, or out-of-bounds read or write).

NVD Source

Technical Analysis

CVE-2021-38563 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.