What is CVE-2021-45948?

CVE-2021-45948 is a medium-severity vulnerability in Assimp, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.

How severe is CVE-2021-45948?

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

Buffer overflow in Assimp

CVE-2021-45948

Open Asset Import Library (aka assimp) 5.1.0 and 5.1.1 has a heap-based buffer overflow in _m3d_safestr (called from m3d_load and Assimp::M3DWrapper::M3DWrapper).

Vulnerability class: Buffer Overflow

Published 2022-01-01 · last modified 2026-06-17.

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: 0.009 (59.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Assimp — versions 5.1.0, 5.1.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/google/oss-fuzz-vulns/blob/main/vulns/assimp/OSV-2021-775.yaml (Third Party Advisory)
bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Third Party Advisory, Issue Tracking)
security.gentoo.org/glsa/202210-01 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45948?: CVE-2021-45948 is a medium-severity vulnerability in Assimp, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.
How severe is CVE-2021-45948?: Medium severity. CVSS v3 base score is 5.5 out of 10.