Beginning on October 24, 2020 there is an update to the (ISC)² exam retake policy which applies to the CISSP, as well as all other (ISC)² exams.
For each of the CISSP, CAP, CCSP, CSSLP, HCISPP, CISSP-ISSAP, CISSP-ISSEP, CISSP-ISSMP and SSCP certification examinations, there are two independent rules that govern exam retake attempts.
If you don’t pass the exam on your first attempt, you may retest after 30 test-free days. If you don’t pass the exam on your second attempt, you may retest after 60 test-free days from your most recent exam attempt. And finally, if you don’t pass the exam on your third attempt (and for all subsequent retakes), you may retest after 90 test-free days from your most recent exam attempt.
Additionally, you may only attempt a particular (ISC)² exam as many as four times during a 12-month period. However, candidates may pursue multiple certifications simultaneously.