CVE-2021-39521: GNU Libredwg

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c. It allows an attacker to cause Denial of Service.

Affected products

• GNU Libredwg: up to and including 0.10.1.3751

Published 2021-09-20. Last modified 2026-06-17.