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First seenSep 22, 2026
Last mentionedSep 22, 2026

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Researcher Drops BigDiskBuster Zero-Day PoC That Blocks Microsoft Defender Updates

Researcher publishes unpatched BigDiskBuster PoC that can block Microsoft Defender signature and platform updates.

The Hacker NewsSep 22, 16:14 UTC · Sep 22, 2026Exploit / PoCCVE-2026-454983 · 2 reads

Related CVEs

by mentions

CVE-2026-4549863%7.5
Denial-of-Service Vulnerability in Microsoft Defender Antimalware Platform
published May 20, 2026Microsoft Defender (antimalware platform)KEV

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CISAorganization · 1
Microsoftvendor · 1
Windowsproduct · 1
Microsoftorganization · 1
BigDiskBustermalware · 1
RedSunmalware · 1
Microsoft Defenderproduct · 1
UnDefendmalware · 1

Entities are extracted by the model from each article. First seen Sep 22, 2026, last mentioned Sep 22, 2026. Watching keeps it in this browser only (no account); the watchlist page and dashboard alerts use it.