Windows Defender Triple Zero-Day: BlueHammer, RedSun, and UnDefend Actively Exploited in the Wild
Three critical zero-day vulnerabilities — BlueHammer (CVE-2026-33825), RedSun, and UnDefend — have been discovered in Windows Defender’s remediation engine. All three allow local privilege escalation to SYSTEM level and are being actively exploited; only one has been patched so far.
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