What is CVE-2020-21831?

CVE-2020-21831 is a high-severity vulnerability in GNU Libredwg, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-05-17.

How severe is CVE-2020-21831?

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

Buffer overflow in GNU Libredwg

CVE-2020-21831

A heap based buffer overflow vulnerability exists in GNU LibreDWG 0.10 via read_2004_section_handles ../../src/decode.c:2637.

Vulnerability class: Buffer Overflow

Published 2021-05-17 · last modified 2026-07-09.

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: 0.011 (63.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

GNU Libredwg — versions 0.10

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)
github.com/LibreDWG/libredwg/issues/188 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21831?: CVE-2020-21831 is a high-severity vulnerability in GNU Libredwg, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-05-17.
How severe is CVE-2020-21831?: High severity. CVSS v3 base score is 8.8 out of 10.