What is CVE-2021-21824?

CVE-2021-21824 is a critical-severity vulnerability in Accusoft Imagegear, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2021-06-11.

How severe is CVE-2021-21824?

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

Buffer overflow in Accusoft Imagegear

CVE-2021-21824

An out-of-bounds write vulnerability exists in the JPG Handle_JPEG420 functionality of Accusoft ImageGear 19.9. A specially crafted malformed file can lead to memory corruption. An attacker can provide a malicious file to trigger this vulnerability.

Published 2021-06-11 · 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: 0.012 (67.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · 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-2021-1289 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21824?: CVE-2021-21824 is a critical-severity vulnerability in Accusoft Imagegear, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2021-06-11.
How severe is CVE-2021-21824?: Critical severity. CVSS v3 base score is 9.8 out of 10.