What is CVE-2020-21835?

CVE-2020-21835 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-2020-21835?

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

NULL pointer dereference in GNU Libredwg

CVE-2020-21835

A null pointer deference issue exists in GNU LibreDWG 0.10 via read_2004_compressed_section ../../src/decode.c:2337.

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 (57.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.0% 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

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

af854a3a-2127-422b-91ae-364da2661108 (Not Applicable)
github.com/LibreDWG/libredwg/issues/188 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21835?: CVE-2020-21835 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-2020-21835?: Medium severity. CVSS v3 base score is 6.5 out of 10.