What is CVE-2021-21938?

CVE-2021-21938 is a critical-severity vulnerability in Accusoft Imagegear, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2022-04-14.

How severe is CVE-2021-21938?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Accusoft Imagegear

CVE-2021-21938

A heap-based buffer overflow vulnerability exists in the Palette box parser functionality of Accusoft ImageGear 19.10. A specially-crafted file can lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.

Published 2022-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.019 · change: +0.001

Affected products

Accusoft Imagegear — versions 19.10

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1367 (Exploit, Third Party Advisory)
help.accusoft.com/ImageGear/v20.0/Windows/DLL/webframe.html (Product)

Frequently asked questions

What is CVE-2021-21938?: CVE-2021-21938 is a critical-severity vulnerability in Accusoft Imagegear, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2022-04-14.
How severe is CVE-2021-21938?: Critical severity. CVSS v3 base score is 9.8 out of 10.