What is CVE-2021-36489?

CVE-2021-36489 is a medium-severity vulnerability in Liballeg Allegro, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2023-02-03.

How severe is CVE-2021-36489?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Liballeg Allegro

CVE-2021-36489

Buffer Overflow vulnerability in Allegro through 5.2.6 allows attackers to cause a denial of service via crafted PCX/TGA/BMP files to allegro_image addon.

Vulnerability class: Buffer Overflow

Published 2023-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.3th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Liballeg Allegro

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/liballeg/allegro5/issues/1251 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-36489?: CVE-2021-36489 is a medium-severity vulnerability in Liballeg Allegro, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2023-02-03.
How severe is CVE-2021-36489?: Medium severity. CVSS v3 base score is 6.5 out of 10.