CVE-2007-3377: Nlnet Labs Net DNS

Medium severity, CVSS 4.3. EPSS: 2% chance of exploitation in the next 30 days.

Header.pm in Net::DNS before 0.60, a Perl module, (1) generates predictable sequence IDs with a fixed increment and (2) can use the same starting ID for all child processes of a forking server, which allows remote attackers to spoof DNS responses, as originally reported for qpsmtp and spamassassin.

Affected products

• Nlnet Labs Net DNS: version 0.14 only; version 0.20 only; version 0.21 only; version 0.22 only; version 0.23 only; version 0.24 only; …

Published 2007-06-25. Last modified 2026-06-16.