EUVD-2026-56665
GHSA-7jg6-xhfv-6598
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-exposed RPC Runtime, no auth required, but high complexity for heap grooming; full system impact upon success.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in RPC Runtime allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via heap-based buffer overflow in the Windows RPC Runtime affects every supported Windows desktop and server release from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. An unauthenticated remote attacker who can reach an exposed RPC endpoint can corrupt heap memory and achieve arbitrary code execution, yielding full confidentiality, integrity, and availability compromise of the target system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attack requires network-level access to the target host's RPC endpoint - specifically TCP port 135 (the RPC Endpoint Mapper) and the dynamically assigned high ports used by RPC services. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score reflects a meaningful tension: the full C:H/I:H/A:H impact with AV:N/PR:N/UI:N signals critical exploitability potential, but AC:H substantially reduces the practical exploitation rate. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update via Windows Update or WSUS to bring all systems to or above the patched build for their respective release: Server 2025 to 10.0.26100.33296, Server 2022 to 10.0.20348.5499, Server 2019 to 10.0.17763.9115, Server 2016 to 10.0.14393.9418, Server 2012 R2 to 6.3.9600.23337, Server 2012 to 6.2.9200.26279, Windows 11 23H2 to 10.0.22631.7517, Windows 11 24H2 to 10.0.26100.9168, Windows 11 25H2 to 10.0.26200.9168, Windows 11 26H1 to 10.0.28000.2704, Windows 10 21H2/22H2 to 10.0.19044.7663/10.0.19045.7663, and Windows 10 1607/1809 to 10.0.14393.9418/10.0.17763.9115 respectively. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems affected by CVE-2026-62781 (Windows 10 through 11 and Server 2012 through 2025) and audit network exposure of RPC endpoints (TCP/UDP 135, 445); prioritize internet-facing systems and critical infrastructure for immediate action. …
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External POC / Exploit Code
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