Most defense contractors believe they’re compliant—right up until an assessment proves otherwise. The truth is that DFARS compliance often fails not because of one glaring mistake, but because of small, overlooked gaps that quietly pile up over time. Many of these weaknesses hide in plain sight, and a skilled DFARS compliance consultant can spot them long before an auditor or attacker does. Below are five of the most common security gaps that put your compliance—and your contracts—at risk, along with practical steps to close each one.
1. Poorly Defined CUI Boundaries
You can’t protect what you haven’t identified. Many contractors struggle to pinpoint exactly where Controlled Unclassified Information (CUI) lives across their systems, emails, and shared drives.
When CUI flows freely through unmarked files and unsecured folders, your controls become guesswork. Data spreads to endpoints and cloud tools that were never designed to safeguard it. Auditors quickly notice when a company can’t map its own sensitive data.
2. Weak Access Controls
Not everyone in your organization needs access to sensitive defense data—yet many firms grant broad permissions by default. Over time, employees accumulate access they no longer need, and former staff sometimes retain active accounts.
This creates a wide attack surface. A single compromised login can expose protected information across your network. DFARS requires you to limit access based on roles and enforce strong authentication, including multifactor authentication.
3. Missing or Incomplete System Security Plans
Your System Security Plan (SSP) is the backbone of your compliance effort. It documents how you meet each of the 110 controls in NIST SP 800-171. Too often, contractors treat it as a one-time formality that gathers dust.
An outdated or vague SSP signals disorganization and invites scrutiny. Assessors expect a living document that reflects your current environment, along with a Plan of Action and Milestones (POA&M) for any gaps.
4. Unpatched Systems and Poor Configuration Management
Attackers love outdated software. Unpatched operating systems, applications, and firmware create easy entry points into networks that hold defense data. Many breaches trace back to a known vulnerability that a simple update would have fixed.
Configuration drift makes things worse. When systems fall out of their secure baseline, controls weaken without anyone noticing. DFARS expects consistent patching and disciplined configuration management across all assets.
5. Inadequate Incident Response and Monitoring
DFARS requires you to detect, report, and respond to cyber incidents within tight deadlines. Yet many contractors lack the logging and monitoring needed to spot a breach in the first place.
Without continuous monitoring, an intruder can operate undetected for months. And without a tested incident response plan, your team scrambles when an event finally surfaces—missing the 72-hour reporting window and risking further penalties.
Close the Gaps Before They Cost You
These five gaps rarely announce themselves. They build slowly, hiding in permissions no one reviews, plans no one updates, and systems no one patches. By the time an assessment or breach exposes them, the damage—to your contracts, finances, and reputation—is already done.
The smart move is to act before that happens. Don’t wait for an auditor’s findings or an attacker’s intrusion to reveal where you fall short. Partner with a qualified DFARS compliance consultant today to assess your environment, close these vulnerabilities, and keep your business firmly positioned to win and retain defense work.
