CVE-2025-64663

Description

Custom Question Answering Elevation of Privilege Vulnerability

CVSS Details

CVSS Score

9.9

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:microsoft:azure_language:-:*:*:*:*:*:*:* - VULNERABLE

Microsoft Custom Question Answering 组件 - 所有未修补版本

PoC / Exploit Code

⚠ For Security Research Only

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

python

# CVE-2025-64663 PoC - Custom Question Answering EoP
# Note: This is a conceptual PoC based on the vulnerability description
# Actual exploitation requires further analysis

import requests
import json

TARGET_URL = "https://<target>/customquestionanswering/api/endpoint"

def check_vulnerability():
    """Check if target is vulnerable to CVE-2025-64663"""
    headers = {
        "Content-Type": "application/json",
        "Authorization": "Bearer <low-privilege-token>"
    }
    
    # Crafted request that may bypass privilege checks
    payload = {
        "question": "test",
        "knowledgeBaseId": "<kb-id>",
        "answerSpanRequest": {
            "topAnswersWithSpan": True,
            "confidenceScoreThreshold": 0.0
        }
    }
    
    try:
        response = requests.post(TARGET_URL, json=payload, headers=headers, timeout=10)
        
        # Check for signs of successful exploitation
        if response.status_code == 200:
            data = response.json()
            # Check if unauthorized access was granted
            if "answers" in data or "privileged" in str(data).lower():
                return True
        return False
    except Exception as e:
        print(f"Error: {e}")
        return False

if __name__ == "__main__":
    print("CVE-2025-64663 Vulnerability Checker")
    is_vulnerable = check_vulnerability()
    print(f"Vulnerable: {is_vulnerable}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-64663
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-64663
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-64663/
[4] VulDB https://vuldb.com/cve/CVE-2025-64663
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64663

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-64663", "sourceIdentifier": "[email protected]", "published": "2025-12-18T22:16:00.370", "lastModified": "2026-01-16T19:53:36.677", "vulnStatus": "Analyzed", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["exclusively-hosted-service"]}], "descriptions": [{"lang": "en", "value": "Custom Question Answering Elevation of Privilege Vulnerability"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.1, "impactScore": 6.0}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:azure_language:-:*:*:*:*:*:*:*", "matchCriteriaId": "BD4C7E6E-54DF-4430-9555-13F1FDA83E76"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64663", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}