Drop everything.
Critical CVEs that are confirmed exploited or very likely to be. Newest first.
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CVE-2025-59287
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
A CVE is listed as major when it is critical (CVSS 9.0 or higher) and either confirmed exploited in the wild with a real chance of more, or very likely to be exploited (EPSS 40% or more).