CVE-2017-15105: Canonical Ubuntu Linux

Medium severity, CVSS 5.3. EPSS: 2.6% chance of exploitation in the next 30 days.

A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only; version 18.04 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Nlnetlabs Unbound: before 1.6.8 (fixed in 1.6.8)

Published 2018-01-23. Last modified 2026-06-17.