What is CVE-2019-20911?

CVE-2019-20911 is a medium-severity vulnerability in GNU Libredwg, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2020-07-16.

How severe is CVE-2019-20911?

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

Vulnerability in GNU Libredwg

CVE-2019-20911

An issue was discovered in GNU LibreDWG through 0.9.3. Crafted input will lead to denial of service in bit_calc_CRC in bits.c, related to a for loop.

Published 2020-07-16 · last modified 2026-06-17.

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: 0.010 (61.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

GNU Libredwg

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/LibreDWG/libredwg/issues/178 (Exploit, Third Party Advisory)
github.com/LibreDWG/libredwg/commit/c6f6668b82bfe595899cc820279ac37bb9ef16f5 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-20911?: CVE-2019-20911 is a medium-severity vulnerability in GNU Libredwg, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2020-07-16.
How severe is CVE-2019-20911?: Medium severity. CVSS v3 base score is 6.5 out of 10.