CVE-2009-4008: Nlnetlabs Unbound

Medium severity, CVSS 5.0. EPSS: 2.7% chance of exploitation in the next 30 days.

Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.

Affected products

• Nlnetlabs Unbound: up to and including 1.4.3; version 0.0 only; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; …

Published 2011-06-02. Last modified 2026-06-16.