Is CVE-2021-21808 actively exploited?

No active exploitation of CVE-2021-21808 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21808 be exploited remotely?

Yes. CVE-2021-21808 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21808?

CVE-2021-21808 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-21808

CWE-120Published: June 11, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

A memory corruption vulnerability exists in the PNG png_palette_process functionality of Accusoft ImageGear 19.9. A specially crafted malformed file can lead to a heap buffer overflow. An attacker can provide malicious inputs to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-21808 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.