Most businesses assume their network is secure because nothing has gone wrong yet. That’s not evidence of security, it’s an absence of confirmed bad news, and those aren’t the same thing. A network can look fine right up until the moment it very obviously isn’t.
Why “nothing’s happened” isn’t good evidence
Modern breaches are rarely loud. Attackers who gain access frequently sit quietly inside a network for weeks or months, mapping out systems and escalating privileges before doing anything that would actually be noticed. The average dwell time between a breach occurring and it being detected is still measured in weeks for businesses without active monitoring in place. “We haven’t noticed anything” and “nothing has happened” are two very different claims.
How to actually test the assumption
Vulnerability scanning
Automated scanning tools check systems and network devices against known vulnerabilities, flagging outdated software, missing patches and misconfigurations. Run regularly, this catches the low-hanging fruit before it becomes an entry point. Run once and forgotten, it becomes a false sense of security within a few months as new vulnerabilities are discovered.
Penetration testing
Where vulnerability scanning checks for known issues, penetration testing has a person actively attempt to break in, the way a real attacker would. This surfaces the issues automated scanning misses: weak internal segmentation, poor password hygiene, and social engineering vulnerabilities that no scanner can detect.
Reviewing access, not just perimeter defences
A lot of security reviews focus entirely on the perimeter, firewalls, VPNs, external-facing systems, and miss what happens once someone’s already inside. Auditing who has access to what, whether former staff accounts have actually been disabled, and whether admin rights are limited to the people who genuinely need them, closes off the damage an attacker (or a disgruntled former employee) could do after getting past the perimeter.
Checking whether monitoring actually catches anything
Logging and monitoring tools are only useful if someone, or something, is actually watching them and would notice an anomaly. A lot of businesses have logging switched on and nobody reviewing it, which is functionally the same as not having it at all. Testing this means simulating suspicious activity and confirming it actually gets flagged, not just assuming it would.
What good ongoing security actually looks like
Point-in-time testing is useful, but security isn’t a one-off project. It needs continuous patching, active endpoint monitoring, regular access reviews and periodic testing to stay current against threats that evolve constantly. A network that was secure a year ago, with no changes since, is not necessarily secure today.
The only way to know where you actually stand is to test it properly, rather than assume it based on the absence of an obvious incident. If it’s been more than twelve months since your network was properly assessed, that’s worth treating as overdue, not optional.