What is CVE-2020-21816?

CVE-2020-21816 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-2020-21816?

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

Buffer overflow in GNU Libredwg

CVE-2020-21816

A heab based buffer overflow issue exists in GNU LibreDWG 0.10.2641 via htmlescape ../../programs/escape.c:46.

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 (65.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.1% 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 0.10.2641

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

af854a3a-2127-422b-91ae-364da2661108 (Not Applicable)
github.com/LibreDWG/libredwg/issues/182 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21816?: CVE-2020-21816 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-2020-21816?: High severity. CVSS v3 base score is 8.8 out of 10.