CVE-2011-4869: Unbound

High severity, CVSS 7.8. EPSS: 3% chance of exploitation in the next 30 days.

validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.

Affected products

• Unbound Unbound: up to and including 1.4.12; version 0.0 only; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; …

Published 2011-12-20. Last modified 2026-06-16.