Is CVE-2021-21833 actively exploited?

No active exploitation of CVE-2021-21833 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21833 be exploited remotely?

Yes. CVE-2021-21833 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21833?

CVE-2021-21833 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-21833

CRITICAL

CVE-2021-21833

CWE-119Published: June 11, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An improper array index validation vulnerability exists in the TIF IP_planar_raster_unpack functionality of Accusoft ImageGear 19.9. A specially crafted malformed file can lead to an out-of-bounds write. An attacker can provide a malicious file to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-21833 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-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.