What is CVE-2021-44961?

CVE-2021-44961 is a medium-severity vulnerability in Slic3r Libslic3r, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2022-03-01.

How severe is CVE-2021-44961?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Slic3r Libslic3r

CVE-2021-44961

A memory leakage flaw exists in the class PerimeterGenerator of Slic3r libslic3r 1.3.0 and Master Commit b1a5500. Specially crafted stl files can exhaust available memory. An attacker can provide malicious files to trigger this vulnerability.

Published 2022-03-01 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.0th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

Slic3r Libslic3r — versions 1.3.0

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
af854a3a-2127-422b-91ae-364da2661108 (Not Applicable)
hackmd.io/nDT_UKLyRQendxDwil9A4w (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-44961?: CVE-2021-44961 is a medium-severity vulnerability in Slic3r Libslic3r, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2022-03-01.
How severe is CVE-2021-44961?: Medium severity. CVSS v3 base score is 5.5 out of 10.