CVE-2008-1637: Powerdns Recursor

Medium severity, CVSS 6.8. EPSS: 4% chance of exploitation in the next 30 days.

PowerDNS Recursor before 3.1.5 uses insufficient randomness to calculate (1) TRXID values and (2) UDP source port numbers, which makes it easier for remote attackers to poison a DNS cache, related to (a) algorithmic deficiencies in rand and random functions in external libraries, (b) use of a 32-bit seed value, and (c) choice of the time of day as the sole seeding information.

Affected products

• Powerdns Recursor: up to and including 3.1.4

Published 2008-04-02. Last modified 2026-06-16.