Hi,
so, turns out our good old Windows Defender Firewall isn’t exactly the knight in shining armor. Microsoft just patched four shiny new privilege escalation vulnerabilities that could let a low-level user level up like they just found a cheat code in GTA lol.
Yeah, it’s not game over, but it’s definitely multiplayer chaos.
The Offenders
Here’s the lineup of our villains:
| CVE | What went wrong | What an attacker can pull off |
|---|---|---|
| CVE-2025-54104, CVE-2025-54109, CVE-2025-54915 | Classic type confusion. Basically, Windows expects an apple, gets an orange, and instead of saying “WTF?”, it eats it anyway. Boom — attacker slides in malicious payload. | A low-privileged user suddenly upgrades to Local Service. Translation: from cleaning the lobby to running the server room. |
| CVE-2025-53808 | Different flavor, still privilege escalation. Details are fuzzy, but you can bet it’s nasty. | Same deal: rights go brrr. |
But… Do You Need to Panic?
Not yet. These aren’t remote zero-click nightmares. For the magic to happen, an attacker already needs:
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Authenticated access (so they’re already inside your house, just not yet in your fridge).
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Membership in a slightly privileged group — not admin, but not just “guest” either.
Microsoft even labeled three of these as “Less Likely to be exploited”, and one as “Unlikely”.
But let’s be honest: “unlikely” is corporate-speak for “someone on GitHub is already writing a PoC”.
What You Should Do
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Patch. Yes, right now. Don’t wait for Patch Tuesday memes.
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Check your user privileges. If Bob from accounting has “Local Service” rights because “he asked nicely,” fix that yesterday.
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Log and monitor. If someone suddenly gains more powers than Gandalf, you’ll want to know.
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Embrace least privilege. Nobody gets admin until they can answer: “What’s the difference between sudo and su?”
Final Thoughts
These bugs won’t burn the internet down overnight. But in a world where insiders, forgotten accounts, and lazy privilege policies exist, they’re a free invitation for attackers to climb the ladder.
So yeah — Windows Defender Firewall needs defending. Again.
rgds,
Alex