CVE-2020-19861: Nlnetlabs Ldns

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

Affected products

• Nlnetlabs Ldns: version 1.7.1 only

Published 2022-01-21. Last modified 2026-06-17.