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Heap-based buffer overflow in Xbox allows an unauthorized attacker to execute code over a network.
No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.
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Explore global source statements, affected packages and advisory history for CVE-2026-66801. The catalog has a separate collection scope from Microsoft release records.
CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.
No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.
Heap-based buffer overflow in Xbox allows an unauthorized attacker to execute code over a network.
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CVSS 3.1 · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C