Name: TIPS on Conducting NIST 800-53 Rev4 to Rev5 Control GAP Analysis
Uploaded: 2023-09-21 00:00:24
Duration: 25 min 12 s

Question 1

How do I do a NIST 800-53 Rev 4 to Rev 5 gap analysis?

Accepted Answer

I start by getting the official Rev 5 publications and familiarizing myself with the structure, especially the fact that baselines are in 800-53B now. Next, I identify my existing Rev 4 controls and implementation statements in the SSP. Then I compare Rev 4 vs Rev 5 control-by-control, tracking what changed, what parameters were added, and what was withdrawn or incorporated elsewhere.

Question 2

What are the major changes from NIST 800-53 Rev 4 to Rev 5?

Accepted Answer

Rev 5 added 66 new base controls and 202 new control enhancements. It also added 131 new control parameters to existing controls, which is where a lot of SSP updates come from. And there are 90 controls that were withdrawn but incorporated into other controls, so you have to map them correctly instead of just deleting coverage.

Question 3

What is a control parameter in NIST 800-53 and why does it matter for the SSP?

Accepted Answer

A control parameter is a specific setting/value tied to how you implement a control—like password length, history, or complexity. In Rev 5, a lot more parameters were added, so your implementation statement needs to reflect those choices. If you ignore parameters, your SSP won’t line up with what Rev 5 is actually calling for.

Question 4

Why do I need NIST 800-53B for this transition?

Accepted Answer

Because in Rev 5, the baseline controls aren’t presented the same way as before. The baselines are in 800-53B, and the “B” is literally the baseline document. If you don’t use 800-53B, you’ll struggle to build the right control set for your system baseline during the gap analysis.

Question 5

How did AC-1 change from Rev 4 to Rev 5?

Accepted Answer

AC-1 kept the same control number, but the title changed—Rev 5 drops the “Access Control” wording and calls it “Policy and Procedure.” More importantly, Rev 5 adds parameters like selecting the level (org/mission/system), consistency with laws/executive orders, and designating an official to manage development and dissemination. It also adds event-based review triggers, not just a fixed review frequency.

Question 6

What happens to withdrawn controls in Rev 5 (are they deleted)?

Accepted Answer

A lot of them aren’t just “gone”—they’re incorporated into other controls. For example, AC-2 enhancement (10) in Rev 4 is withdrawn in Rev 5 and incorporated into AC-2k. Practically, that means you remove the old enhancement entry from your SSP and ensure the implementation is captured under the new location.

Question 7

What spreadsheet or method do you recommend for tracking Rev 4 vs Rev 5 differences?

Accepted Answer

I recommend a side-by-side spreadsheet that tracks the Rev 4 control number/title/requirement/implementation statement and the Rev 5 version right next to it. That makes it easy to spot new parameters, title changes, and where your implementation statement must be updated. It also helps when the work is split across multiple team members by control families.

TIPS on Conducting NIST 800-53 Rev4 to Rev5 Control GAP Analysis

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