Statement Regarding CVE-2021-44228 (log4j vulnerability)

Select a product:

Please note:

If you are experiencing difficulties with our software, or have a question about a product you have already purchased, our technical support representatives can help. To expedite this process, please have the following information available before contacting ISC:

  • Your name, organization, and phone number
  • The ISC product name, version, and serial number
  • Your platform (relevant hardware/operating system information)

You may contact technical support by phone Monday through Friday from 8:30 am to 5:00 pm Central time: (708) 445-9415.  You may also contact technical support after business hours by sending a message to “tech at”

Technical Support Policy

Technical support (including free upgrades) for an ISC product is normally provided for a period of one year commencing on your purchase date as part of our standard licensing agreement.

This standard 1-year technical support period can be extended by purchasing a renewable maintenance contract. Annual maintenance agreements ensure continued access to technical support and software updates.