Seven beliefs about vulnerability management are common and wrong, including that critical scores are always most urgent, that most known flaws get exploited, and that a clean scan means you are safe. Each myth below comes with the fact, the reason, and a better habit.
TL;DR
- A high score is not the same as high risk.
- Only a small share of known flaws are exploited in the wild.
- Zero findings is not the goal. Fast, ordered fixing is.
- A clean scan means no known flaws were found, nothing more.
- Fixing flaws is a team job, not only a security job.
Why do myths matter in vulnerability management?
Teams have limited time. A wrong belief sends that time to the wrong place. If you think every Critical label is an emergency, you burn a week on items attackers ignore. If you think a clean scan means safety, you stop looking.
Start with two terms. A vulnerability is a flaw in software that someone could misuse. Vulnerability management is the routine of finding, ranking and fixing those flaws. For the full definition, read what vulnerability management is.
Myth 1: Does a Critical score mean it is the most urgent item?
Fact: not necessarily. CVSS, the scoring system maintained by FIRST, rates how severe a flaw is. FIRST's user guide says base scores are designed to measure severity and should not be used alone to assess risk. The base score ignores whether the flaw is being attacked and whether your system is exposed.
Better habit: use the score to order items inside a group, after you check exploitation, exposure and importance. See what a CVSS 9.8 tells you and misses.
Myth 2: Do attackers exploit most known vulnerabilities?
Fact: no, only a small share. FIRST's EPSS FAQ states that in any 30 day window, roughly 2.5 to 3 percent of published flaws are observed being exploited, and that the CISA Known Exploited Vulnerabilities catalog lists roughly 0.5 percent of published flaws.
This is good news. It means you can reduce risk a lot by finding the small slice that matters. It is not permission to ignore the rest, because the flaws that are exploited are exactly the ones that hurt.
Better habit: check each finding against the known exploited list and an exploit probability such as EPSS. See EPSS in plain language.
Myth 3: Is the goal to reach zero open vulnerabilities?
Fact: the goal is to fix the dangerous ones quickly and to manage the rest on purpose. New flaws are published all the time, so a count of zero lasts, at best, until the next scan. Chasing zero also pushes teams toward risky mass upgrades.
Better habit: measure the age of your oldest dangerous item, how many known exploited flaws are open, and how fast you close items. Read the beginner overview for starter measures.
Myth 4: Does a clean scan mean I am safe?
Fact: a clean scan means no known flaws matched the software the scanner could see. It cannot see software it was not pointed at. It does not find unknown flaws. It does not check mistakes in your own settings or logic.
Think of a medical test for one disease. A negative result is good news about that disease. It is silent about everything else.
Better habit: pair scanning with a complete list of what you run, and treat a clean result as one signal. See how to list your software before scanning.
Myth 5: Is fixing vulnerabilities the security team's job?
Fact: security finds and ranks, but the people who own the software usually fix. A security team cannot safely change every codebase. The owner knows how the code works and how to test a change.
Better habit: give every finding a named owner and a due date, and make tickets that a developer can act on. See what a good vulnerability ticket says.
Myth 6: If a fix is available, should I apply it immediately?
Fact: apply it quickly, but with testing. A fix that breaks your product is its own incident. The smallest upgrade that removes the flaw is usually the safest. For items on the known exploited list, speed matters more, and CISA recommends including a requirement to address them right away in your plan.
Better habit: pick the lowest fixed version, test, deploy, then rescan. See what fix available means.
Myth 7: Do only famous, newly published vulnerabilities matter?
Fact: fame is not a criterion. CISA lists a flaw in its catalog when it has a CVE ID, there is reliable evidence of exploitation in the wild, and there is a clear remediation action. A quiet, unnamed flaw in an everyday package can meet those tests while a flaw with a logo and a website never does.
Better habit: let evidence, not headlines, drive priority. Check the catalog, and watch for new additions that match software you run.
What do the myths look like in one table?
| Myth | Fact | Habit |
|---|---|---|
| Critical means most urgent | Score measures severity, not risk | Add exploitation and exposure |
| Most flaws get exploited | A small share do | Find your small slice |
| Aim for zero | Aim for fast, ordered fixing | Track age and exploited items |
| Clean scan means safe | Means no known match | Pair with a full inventory |
| Security fixes everything | Owners fix | Name an owner per finding |
| Apply fixes blindly | Apply fast, with tests | Smallest fixed version, then rescan |
| Only famous flaws matter | Evidence matters | Watch the exploited list |
A worked example with invented numbers
These numbers are invented to show the effect of the myths. They are not from a real team.
A team has 100 open findings: 10 labeled Critical, 30 High, 60 Medium or Low. Believing myth 1, they plan to fix the 10 Critical items first, which takes two weeks.
Checking the facts instead, they find that 2 findings are on the known exploited list. One is labeled High and one is Medium. Neither was in the Critical group. Of the 10 Critical items, 6 are in code the application never calls.
The result: following the myth, the team spends two weeks on items with low practical danger while two exploited flaws wait. Following the facts, they fix those 2 first, in days, then take the 4 reachable Critical items, then the rest.
Try it yourself
Click through it at your own pace, or open it full screen. Notice how attention goes to what is being exploited now, which is the idea behind busting myths 1, 2 and 7.
How can Safeguard help?
Safeguard offers zero-day discovery, reachability analysis and SBOM and dependency scanning, so you can see which flaws are in code you use and which are drawing attention. Policies and gates turn your priorities into rules on pull requests. Autonomous remediation can open fix pull requests, off by default with every category on Manual. You can try the free scan at gold.safeguard.sh/scan.
Quick check
If only a small share of flaws are exploited, can I skip the rest?
No. Schedule them. The facts can change, and a flaw can later be added to the known exploited list. Keep an owner and a review date.
Is a Low score ever urgent?
Yes, if the flaw is being exploited, sits on an exposed system, or protects something important. Context can outweigh the label.
What is the one number to watch if I can only pick one?
The count of open flaws on the known exploited list that run in your environment. It should be zero or falling fast.
Sources
- FIRST, CVSS v4.0 User Guide
- FIRST, EPSS Frequently Asked Questions
- CISA, Reducing the Significant Risk of Known Exploited Vulnerabilities
Last reviewed: 19 October 2026.
