CVE-2026-20924

// CVE-2026-20924 PoC - Windows Management Services Use-After-Free // This PoC demonstrates the vulnerability pattern (educational purposes only) #include <windows.h> #include <stdio.h> #include <winternl.h> // Simplified PoC structure for vulnerability demonstration typedef struct _MANAGEMENT_SERVICE_OBJECT { PVOID vtable; DWORD refCount; PVOID allocatedBuffer; DWORD bufferSize; } MANAGEMENT_SERVICE_OBJECT, *PMANAGEMENT_SERVICE_OBJECT; // Trigger the use-after-free condition void TriggerUAF() { printf("[*] CVE-2026-20924 PoC - Windows Management Services UAF\n"); printf("[*] Target: Windows with vulnerable Windows Management Services\n\n"); // Step 1: Create initial object PMANAGEMENT_SERVICE_OBJECT pObject = (PMANAGEMENT_SERVICE_OBJECT)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MANAGEMENT_SERVICE_OBJECT) ); if (pObject == NULL) { printf("[-] Failed to allocate object\n"); return; } printf("[+] Step 1: Created management service object at %p\n", pObject); // Step 2: Allocate buffer and assign to object pObject->allocatedBuffer = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 0x1000 ); pObject->bufferSize = 0x1000; pObject->refCount = 1; printf("[+] Step 2: Allocated buffer at %p\n", pObject->allocatedBuffer); // Step 3: Free the object (simulating the vulnerability) printf("[+] Step 3: Freeing object (simulating vulnerability condition)\n"); HeapFree(GetProcessHeap(), 0, pObject); // Step 4: Use freed object (UAF condition - accessing freed memory) printf("[+] Step 4: Attempting to access freed object at %p\n", pObject); printf("[!] UAF Condition: Object accessed after free\n"); printf("[!] This is the vulnerability - freed memory may contain attacker-controlled data\n"); // In real exploitation, attacker would spray heap and control object layout // to achieve arbitrary code execution with elevated privileges printf("\n[*] Note: This is a simplified demonstration of the vulnerability pattern\n"); printf("[*] Real exploitation requires specific conditions and Windows version\n"); } int main() { printf("========================================\n"); printf(" CVE-2026-20924 PoC Demonstration\n"); printf(" Windows Management Services UAF\n"); printf("========================================\n\n"); TriggerUAF(); printf("\n[*] PoC completed\n"); return 0; }

{"cve": {"id": "CVE-2026-20924", "sourceIdentifier": "[email protected]", "published": "2026-01-13T18:16:19.027", "lastModified": "2026-01-16T14:37:34.167", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Uso después de liberar en los Servicios de administración de Windows permite a un atacante autorizado elevar privilegios localmente."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.1, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.17763.8276", "matchCriteriaId": "DD4CBDAB-7626-4048-8474-B1BD9C1F3255"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.17763.8276", "matchCriteriaId": "A6D4C631-2CC0-407C-9ACA-7C151006598C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19044.6809", "matchCriteriaId": "1895E186-5B2E-43CC-AF1F-B5C95419D8C5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19045.6809", "matchCriteriaId": "B7CB5184-1BA1-4D71-8AE3-CF4C6B63A469"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.22631.6491", "matchCriteriaId": "8D675DAA-4DCE-4727-BE5F-C954BBD252C4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7623", "matchCriteriaId": "D249551B-1433-4E5E-A587-40F782E91E09"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.7623", "matchCriteriaId": "22082D4E-E68F-4E48-98FB-42DFDEE2E2A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.8276", "matchCriteriaId": "A74970A1-CC81-4482-B465-8382B1544EF3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.4648", "matchCriteriaId": "C4AA6991-DE34-48F6-AFD3-77CEE7FBB692"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.2092", "matchCriteriaId": "BA5947E0-C44C-4517-A307-DA79752F30A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.32230", "matchCriteriaId": "D44880ED-E8E9-49A8-BD56-503C63D40000"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20924", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}