What is CVE-2021-21821?

CVE-2021-21821 is a critical-severity vulnerability in Accusoft Imagegear, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-07-08.

How severe is CVE-2021-21821?

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

Buffer overflow in Accusoft Imagegear

CVE-2021-21821

A stack-based buffer overflow vulnerability exists in the PDF process_fontname functionality of Accusoft ImageGear 19.9. A specially crafted malformed file can lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.

Vulnerability class: Buffer Overflow

Published 2021-07-08 · 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: 0.020 (79.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Accusoft Imagegear — versions 19.9
Accusoft — versions Accusoft ImageGear 19.9

Weakness classification (CWE)

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1286 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21821?: CVE-2021-21821 is a critical-severity vulnerability in Accusoft Imagegear, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-07-08.
How severe is CVE-2021-21821?: Critical severity. CVSS v3 base score is 9.8 out of 10.