CVE-1999-1521 — Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow…¶
Key facts
CVE-1999-1521 is a Critical (10.0) vulnerability: Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-1999-1521 |
| Severity | Critical (10.0) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 1999/CVE-1999-1521/ |
Details¶
English | 한국어
Description¶
Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow attack in the MAIL FROM command that may allow a remote attacker to execute arbitrary code on the server.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-1999-1521 |
| CVSS Score | 10.0 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/1999/CVE-1999-1521/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-1999-1521
# 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¶
- http://marc.info/?l=bugtraq&m=93720402717560&w=2
- http://marc.info/?l=bugtraq&m=94121824921783&w=2
- http://www.securityfocus.com/bid/633
- https://exchange.xforce.ibmcloud.com/vulnerabilities/2240
- http://marc.info/?l=bugtraq&m=93720402717560&w=2
- http://marc.info/?l=bugtraq&m=94121824921783&w=2
- http://www.securityfocus.com/bid/633
- https://exchange.xforce.ibmcloud.com/vulnerabilities/2240
Generated by PoC Generator on 2026-01-25T16:50:19.932011668
Frequently asked questions¶
What is CVE-1999-1521?¶
CVE-1999-1521 is a Critical (10.0) vulnerability: Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-1999-1521?¶
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-1999-1521?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.