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CVE-2021-32030 — The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra…

Key facts

CVE-2021-32030 is a Critical (9.8) vulnerability: The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-02), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2021-32030 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-02), confirming exploitation in the wild. Federal remediation deadline: 2025-06-23. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2021-32030
Severity Critical (9.8)
CISA KEV Actively exploited (added 2025-06-02)
Detection / prevention —
PoC poc.py
Source 2021/CVE-2021-32030/

Details

English | 한국어

Description

The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra Mini before 3.0.0.4_384_46630 allows authentication bypass when processing remote input from an unauthenticated user, leading to unauthorized access to the administrator interface. This relates to handle_request in router/httpd/httpd.c and auth_check in web_hook.o. An attacker-supplied value of '\0' matches the device's default value of '\0' in some situations. Note: All versions of Lyra Mini and earlier which are unsupported (End-of-Life, EOL) are also affected by this vulnerability, Consumers can mitigate this vulnerability by disabling the remote access features from WAN.

Vulnerability Details

Property Value
CVE ID CVE-2021-32030
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2021/CVE-2021-32030/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-2021-32030

# 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://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
  • https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/
  • https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/
  • https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass
  • https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
  • https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030

Generated by PoC Generator on 2026-06-26T09:44:54.51308141

Frequently asked questions

What is CVE-2021-32030?

CVE-2021-32030 is a Critical (9.8) vulnerability: The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2025-06-02), confirming active exploitation in the wild.

How do I detect CVE-2021-32030?

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-2021-32030?

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-2021-32030 actively exploited?

Yes. CVE-2021-32030 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2025-06-02, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2025-06-23. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.