WSUS
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Attackers exploit patched WSUS flaw to deploy infostealer on unpatched Windows servers
Attackers have been observed exploiting CVE-2025-59287 in WSUS to deploy an infostealer on unpatched Windows servers, exfiltrate data to webhook.site URLs and use follow-up tooling including Velociraptor and a UPX-packed Skuld Stealer; agencies and vendors are urging immediate patching and investigation.
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Microsoft issues out-of-band fix for WSUS vulnerability CVE-2025-59287
Microsoft released an out-of-band cumulative update to address CVE-2025-59287, a critical WSUS deserialization vulnerability being exploited in the wild; admins should apply the patch or disable WSUS/block ports 8530 and 8531 until systems can be rebooted after updating.
