Microsoft has urgently addressed a high-severity privilege escalation vulnerability (CVE-2025-21420) in the Windows Disk Cleanup Utility (cleanmgr.exe) during its February 2025 Patch Tuesday updates. The flaw, scoring 7.8 on the CVSS scale, enabled attackers to execute malicious code with SYSTEM privileges through DLL sideloading techniques. Technical Mechanism of the Exploit The vulnerability leverages cleanmgr.exe’s privileged […] The post Windows Disk Cleanup Tool Exploit Allows SYSTEM Privilege Escalation appeared first on GBHackers Security | #1 Globally Trusted Cyber Security News Platform.
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