CVE-2019-13207: Nlnetlabs Name Server Daemon

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.

Affected products

• Nlnetlabs Name Server Daemon: version 4.2.0 only

Published 2019-07-03. Last modified 2026-06-17.