CVE-2025-33073 — Improper access control in Windows SMB allows an authorized attacker to elevate…¶
Key facts
CVE-2025-33073 is a High (8.8) vulnerability: Improper access control in Windows SMB allows an authorized attacker to elevate…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-20), confirming active exploitation in the wild.
Actively exploited — on the CISA KEV catalog
CVE-2025-33073 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-20), confirming exploitation in the wild. Federal remediation deadline: 2025-11-10. Prioritise patching and deploy the detection and prevention rules below.
| CVE | CVE-2025-33073 |
| Severity | High (8.8) |
| CISA KEV | Actively exploited (added 2025-10-20) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2025/CVE-2025-33073/ |
Details¶
English | 한국어
Description¶
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2025-33073 |
| CVSS Score | 8.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2025/CVE-2025-33073/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2025-33073
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-products
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073
Generated by PoC Generator on 2026-07-09T02:50:36.137458482
Frequently asked questions¶
What is CVE-2025-33073?¶
CVE-2025-33073 is a High (8.8) vulnerability: Improper access control in Windows SMB allows an authorized attacker to elevate…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-10-20), confirming active exploitation in the wild.
How do I detect CVE-2025-33073?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2025-33073?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
Is CVE-2025-33073 actively exploited?¶
Yes. CVE-2025-33073 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2025-10-20, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2025-11-10. Prioritise patching and deploy the detection and prevention rules above.
For authorized security testing and research only. See the full source and NVD record.