Microsoft’s Patch Tuesday fixes 175 vulnerabilities, including two actively exploited zero

CVE-2025-59287 is a deserialization of untrusted data flaw (CWE-502) in the Microsoft Windows Server Update Service (WSUS) that permits remote code execution. It is triggered when the WSUS service processes attacker-controlled serialized input, allowing an attacker to run arbitrary code on the server hosting the WSUS role. Organizations running WSUS are affected — typically enterprises that use the role for internal Windows update management — and CISA lists the affected scope as Microsoft Windows broadly. The issue is confirmed exploited in the wild: it was added to the CISA KEV catalog on 2025-10-24, and the EPSS model assigns a 100% (100th percentile) probability of exploitation within 30 days, though no public proof-of-concept is known. CVSS scoring is not yet available, so defenders should treat it as a high-priority remote code execution issue until more detail is published.

Do: Apply Microsoft's latest WSUS security updates on every Windows Server with the WSUS role enabled and verify patch status through your update and configuration-management tooling. Where the WSUS role is not required, disable or remove it, and restrict inbound network access to WSUS service ports (typically TCP 8530/8531) from untrusted networks. Federal agencies must apply the required mitigations per CISA BOD 22-01 given the KEV listing.

Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges over a network.

CVE-2025-55315 is an HTTP request/response smuggling vulnerability (CWE-444) in Microsoft ASP.NET Core, in which inconsistent interpretation of HTTP requests between the application and other HTTP-processing components can desynchronize request handling. An authorized (low-privileged) network attacker triggers it by sending crafted HTTP requests, and gains the ability to bypass a security feature; the scope-changed CVSS 9.9 score (C:H/I:H/A:L) indicates the bypass can affect resources beyond the vulnerable component with high confidentiality and integrity impact. All applications built on affected ASP.NET Core versions are in scope, Visual Studio 2022 is listed as an affected product, and related news coverage flags QNAP NetBak PC Agent as an impacted downstream product. No public proof-of-concept or CISA KEV listing exists, so exploitation is not confirmed in the wild, but the 65.8% EPSS (99th percentile) signals a high predicted likelihood of exploitation within 30 days. Microsoft addressed the flaw as part of its recent Patch Tuesday release covering 175 vulnerabilities.

Do: Apply Microsoft's latest security updates for ASP.NET Core (runtime/SDK components) and Visual Studio 2022 immediately; exact patched version numbers are listed in Microsoft's advisory. QNAP NetBak PC Agent users should install the updated build referenced in QNAP's advisory. Given the 65.8% EPSS, prioritize internet-facing ASP.NET Core applications—especially those behind reverse proxies or load balancers where smuggling bypasses front-end security controls—and monitor for a public PoC or KEV listing.

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