CVE-2025-21391, the zero-day Windows storage flaw, stems from the way Windows resolves file paths and follows links, Walters said. File deletion is just the beginning of the problems it could cause, as it could lead to privilege escalation, unwanted access to security logs or configurations, malware injection, data manipulation, or other attacks.

Microsoft has rolled out the February 2025 Patch Tuesday updates, KB5051987 and KB5051989, for Windows 11 24H2 and 23H2, as reported by Bleeping Computer. After installing the updates, the build number for Windows 11 version 24H2 will change to Build 26100.3194, while version 23H2 will be updated to Build 226x1.4890.

Today is Microsoft' 2025 Patch Tuesday, which includes security updates for 55 flaws, including four zero-day vulnerabilities, with two actively exploited in attacks.

The latest updates resolve more glitches and security flaws - some critical - in Windows 11 23H2 and 24H2, so you'll want to install them sooner rather than later.

All supported Windows operating systems will receive an update this month for a buffer overflow vulnerability that carries the catchy name CVE-2025-21418. This patch should be a priority for enterprises, as Microsoft says it is being exploited, has low attack complexity, and no requirements for user interaction.

Patch Tuesday Microsoft’s February patch collection is mercifully smaller than January’s mega-dump. But don't get too relaxed – some deserve close attention, and other vendors have stepped in with plenty more fixes. Of the 63 patches (including six released earlier in the month) Microsoft announced, two are already being exploited.

Microsoft is correcting 57 vulnerabilities in its February Patch Tuesday, two of which are being actively exploited in the wild, and three of which are ‘critical’.

Microsoft patches 63 flaws, including two exploited Windows vulnerabilities (CVE-2025-21391, CVE-2025-21418). CISA requires fixes by March 4.

Windows 11 update packs a raft of important fixes for nasty audio bugs and an Auto HDR glitch that has been seriously frustrating for gamers.