Is CVE-2021-21946 actively exploited?

No active exploitation of CVE-2021-21946 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21946 be exploited remotely?

Yes. CVE-2021-21946 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21946?

CVE-2021-21946 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-21946

CWE-122Published: April 14, 2022· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

Two heap-based buffer overflow vulnerabilities exists in the JPEG-JFIF lossless Huffman image parser functionality of Accusoft ImageGear 19.10. A specially-crafted file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger these vulnerabilities.This heap-based buffer overflow takes place when the `SOF3` precision is lower than 9.

NVD Source

Technical Analysis

CVE-2021-21946 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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 8.8.