Patch Tuesday

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Patch Tuesday (also known as Update Tuesday) is an unofficial term used to refer to when Microsoft, Adobe, Oracle and others regularly release software patches for their software products. It is widely referred to in this way by the industry. Patch Tuesday occurs on the second Tuesday of each month. Microsoft formalized Patch Tuesday in October 2003. Patch Tuesday is known within Microsoft also as the "B" release, to distinguish it from the "C" and "D" releases that occur in the third and fourth weeks of the month, respectively. Critical security updates are occasionally released outside of the normal Patch Tuesday cycle; these are known as "Out-of-band" releases. As far as the integrated Windows Update (WU) function is concerned, Patch Tuesday begins at 10:00 a.m. Pacific Time. Vulnerability information is immediately available in the Security Update Guide. The updates show up in Download Center before they are added to WU, and the KB articles are unlocked later. Daily updates consist of malware database refreshes for Microsoft Defender and Microsoft Security Essentials; these updates are not part of the normal Patch Tuesday release cycle.