Red Hat Linux Errata
Security advisories and updates (patches) for all supported versions.
Red Hat Linux Security Resource Center
Alerts, whitepapers, articles, presentations, and tools.
SCO
Security information for Caldera OpenLinux, OpenServer, OpenUnix, and UnixWare.
Sun Microsystems
Security and recommended patches for Solaris: patch clusters and individual patches.
SuSE Linux
Patches directories for all supported versions, plus a security announcements list (English).
Apache Web Server
Advisories and patches.
Cisco
Patches and advisories for Cisco products
Citrix
Security bulletins and hotfixes for Citrix products
Compaq
Patches and advisories for most Compaq products.
Debian GNU/Linux
Security alerts and fixes.
Digital UNIX (Tru64)
Security and other patches.
FreeBSD
Advisories, mailing lists, tips, tricks, guidelines, links.
HP Electronic Support Center
Some patch-related information near the top.
IRIX
Patches available to all interested parties.
IRIX Patch Sets
Collections of patches that Silicon Graphics recommends. Generally includes all security patches as of the patchset release date.
IRIX Patches
All patches; also the "replaced patches" cross-reference.
IRIX Security Advisories
All SGI IRIX advisories.
Macromedia
Security bulletins and technical briefs that provide information to customers.
Microsoft
Download security updates, service packs, and anti-spyware tools for Windows.
Microsoft Security
Microsoft-product-related security headlines and bulletins.
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