What is CVE-2020-21817?

CVE-2020-21817 is a medium-severity vulnerability in GNU Libredwg, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-05-17.

How severe is CVE-2020-21817?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in GNU Libredwg

CVE-2020-21817

A null pointer dereference issue exists in GNU LibreDWG 0.10.2641 via htmlescape ../../programs/escape.c:29. which causes a denial of service (application crash).

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% 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

GNU Libredwg — versions 0.10.2641

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

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-2020-21817?: CVE-2020-21817 is a medium-severity vulnerability in GNU Libredwg, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-05-17.
How severe is CVE-2020-21817?: Medium severity. CVSS v3 base score is 6.5 out of 10.