PostgreSQL 7.3.x before 7.3.14, 7.4.x before 7.4.12, 8.0.x before 8.0.7, and 8.1.x before 8.1.3, when compiled with Asserts enabled, allows local users to cause a denial of service (server crash) via a crafted SET SESSION AUTHORIZATION command, a different vulnerability than CVE-2006-0553.
PostgreSQL 8.0.x before 8.0.6 and 8.1.x before 8.1.2, when running on Windows, allows remote attackers to cause a denial of service (postmaster exit and no new connections) via a large number of simultaneous connection requests.