What is CVE-2021-36080?

CVE-2021-36080 is a high-severity vulnerability in GNU Libredwg, classified under Double Free. CVSS score: 8.8/10. Published 2021-07-01.

How severe is CVE-2021-36080?

High severity. CVSS v3 base score is 8.8 out of 10.

Double Free in GNU Libredwg

CVE-2021-36080

GNU LibreDWG 0.12.3.4163 through 0.12.3.4191 has a double-free in bit_chain_free (called from dwg_encode_MTEXT and dwg_encode_add_object).

Vulnerability class: Double Free

Published 2021-07-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.9th percentile), scored 2026-10-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

GNU Libredwg

Weakness classification (CWE)

CWE-415 — Double Free

References

bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/google/oss-fuzz-vulns/blob/main/vulns/libredwg/OSV-2021-495.yaml (Third Party Advisory)
github.com/LibreDWG/libredwg/commit/9b6e0ff9ef02818df034fc42c3bd149a5ff89342 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36080?: CVE-2021-36080 is a high-severity vulnerability in GNU Libredwg, classified under Double Free. CVSS score: 8.8/10. Published 2021-07-01.
How severe is CVE-2021-36080?: High severity. CVSS v3 base score is 8.8 out of 10.