Your Linux Server Is Not Automatically Secure, Nor is it More Secure Than Windows Out-Of-The-Box

Scope: Debain Distributions.

In 2025, I posted a series of videos on TikTok arguing that Linux is not inherently more secure than Windows, and more importantly, what we can actually do about it. Combined, the videos pushed past a million views, and the comments lit up fast.

A lot of Linux users were livid. The defensive responses poured in, and I kept thinking: how does an open-source community have so much resistance to improvement suggestions?

Looking back, it makes sense. If you switched to Linux partly because you believed it was more secure, having that assumption challenged feels like a personal attack. But as someone who is coming to love Debian myself, I'd rather face the uncomfortable truth and actually patch the holes, because securing a system is the fun part.

There is no better time than the present to learn Linux hardening concepts, lest you be stuck with one OS option throughout your life. Here's why Linux is not inherently more secure, and what you can do about it on your own machine.

Why does this even matter?

"Windows has way more CVEs." 

A common rebuttal is: "Windows has way more CVEs." That's true, and seems to be increasing due to questionable human-out-of-the-loop development practices, but it's also a red herring. Windows has a larger desktop market share, so it attracts more attention from vulnerability researchers and attackers alike.

What often gets glossed over is that Linux and Unix-based systems power a massive share of critical infrastructure. That's web servers, cloud backends, financial systems, and various network devices. Linux vulnerabilities may be fewer in number, but the systems they affect are often far more consequential. This is why the security assumptions we bring to Linux matter so much.

Popular misinformation.

"I'm now invulnerable to tracking and exploitation." 

Switching to Linux can reduce your exposure to certain kinds of telemetry baked into proprietary operating systems. But it doesn't make you invisible, and it definitely doesn't make you malware-proof.
Linux-targeting malware exists, it's active, and it's evolving. A recent example from early 2026 features a super-worm, developed for research & education purposes:

More on Centipede:

• !"The exploiter automatically detects kernel version, architecture (x86_64 or AARCH64), checks available kernel modules and capabilities, and chains exploits until root is obtained." - ek0ms
• !"DirtyFrag and Fragnesia run sequentially — if one fails due to kernel memory layout differences, the other may succeed." - ek0ms
• !"The unified Copy-Fail exploit includes both x86_64 and ARM64 payloads, making Centipede effective across cloud instances, Raspberry Pi botnets, and ARM-based servers." - ek0ms
• !There are eight steps in the exploit chain, four C2 communication layers, and (at least) fourteen payload items and tools.
• !The software lives under MIT licensure, among the most permissive out there. Anyone can use Centipede if they know how.

That's just one example. There are plenty more like it. Linux being less common on the desktop doesn't mean it's been ignored in the red-team community, especially when Linux runs many internet's servers.

And then there's the tracking that has nothing to do with your OS at all. Browser fingerprinting, cookies, tracking pixels, and session analytics follow you regardless of whether you're on Debian, macOS, or Windows. The moment you open a browser, you're exposed to application layer tracking.

Your firewall is off.

The firewall is technically "on" — but it's not stopping anything.

This one seemed to surprise a lot of people. On most Debian-based distributions, the firewall service (typically ufw or iptables) is installed and technically running. But the default ruleset is set to allow all traffic in and out. Insane, I know, but Linux was initially designed with a user-base in mind that is intimately familiar with technology.

A firewall that allows everything is not a firewall. You need to actually configure it. Enabling ufw and setting a default-deny policy for incoming connections is one of the first things you should do on any fresh install, unless you're intentionally keeping ports open for red-teaming, honey-potting, or development purposes.

While plenty of bad traffic is blocked at the network edge, likely within your router instead of on your computer locally, that shouldn't be your reason for neglecting enabling the local firewall. ever.

Security through obscurity.

"Well, Linux has less CVE's than Windows."

Much of Linux's reputation for security historically comes from the fact that it was simply less targeted. Fewer users meant fewer attackers bothered writing exploits for it. That's not security, that's obscurity.

Linux was not founded with the goal of out-securing Windows, or any other operating system. The goal was to build open-source software off of Minix, with much emphasis placed on the custom, free licensure and concept of community-led developments. Watch this.

As Linux has grown, especially in server environments and, increasingly, on the desktop, that protection has eroded. The same fundamental question applies to any system: is it actually secure, or has it just not been targeted enough yet to expose its weaknesses?

What is the solution?

"Ok, we understand now, how do we fix it?"

STEP 1

Read this: Debian Security Management Manual.

STEP 2

Learn the OSI Model, then secure at every layer

Layer 7 is where a lot of modern attacks happen. A standard firewall operating at layers 3 and 4 can't see inside that traffic. That's why you want an open source, application aware deep packet inspection (DPI) firewall running on your OS. There are plenty of free options that can be used with Linux.

STEP 3

Practice good hygiene

Most breaches don't start with a zero-day

Much of Linux's reputation for security historically comes from the fact that it was simply less targeted. Fewer users meant fewer attackers bothered writing exploits for it. That's not security, that's obscurity.

Linux was not founded with the goal of out-securing Windows, or any other operating system. The goal was to build open-source software off of Minix, with much emphasis placed on the custom, free licensure and concept of community-led developments. Watch this.

As Linux has grown, especially in server environments and, increasingly, on the desktop, that protection has eroded. The same fundamental question applies to any system: is it actually secure, or has it just not been targeted enough yet to expose its weaknesses?

The goal here isn't to scare anyone off Linux, it's quite the opposite. It's a good operating system, and with proper configuration it can be genuinely hardened. But that hardening doesn't happen automatically. The first step is dropping the assumption that its already secure.