Sun Microsystems, Inc. The Network Is The Computer[tm].

Patches and advisories for Cisco products

Security information for Microsoft customers of all types - businesses, consumers, IT pros, and developers. Find information about monthly security updates.

Fixdist - You need the "fixdist" program to install AIX patches.

Advisories, mailing lists, tips, tricks, guidelines, links.

the OpenBSD CD errata page

Security advisories and updates (patches) for all supported versions.

Download security updates, service packs, and anti-spyware tools for Windows.

Alerts, whitepapers, articles, presentations, and tools.

Security and other patches for AIX. Note that this is an FTP site.