CVE-2026-24932

N/A Unknown

📋 TL;DR

This vulnerability allows attackers to perform Man-in-the-Middle attacks on DDNS update communications by exploiting improper TLS/SSL certificate validation. Attackers can intercept sensitive information including user email addresses, MD5-hashed passwords, and device serial numbers. This affects ASUSTOR Data Master (ADM) users running vulnerable versions.

💻 Affected Systems

Products:
  • ASUSTOR Data Master (ADM)
Versions: from 4.1.0 through 4.3.3.ROF1, from 5.0.0 through 5.1.1.RCI1
Operating Systems: ADM (NAS operating system)
Default Config Vulnerable: ⚠️ Yes
Notes: Only affects systems using DDNS service with HTTPS connections

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers intercept DDNS update communications, steal credentials and device information, potentially gaining unauthorized access to the NAS system or using credentials for further attacks.

🟠

Likely Case

Attackers on the same network intercept DDNS traffic, harvest credentials and device information for credential stuffing or targeted attacks against the user.

🟢

If Mitigated

With proper network segmentation and monitoring, impact is limited to credential exposure requiring password resets.

🌐 Internet-Facing: MEDIUM
🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Exploitation requires network position to intercept HTTPS traffic between NAS and DDNS server

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: ADM 4.3.4.RGE1 and later, ADM 5.1.2.RCJ1 and later

Vendor Advisory: https://www.asustor.com/security/security_advisory_detail?id=50

Restart Required: Yes

Instructions:

1. Log into ADM web interface
2. Go to Settings > ADM Update
3. Check for and install latest update
4. Reboot the NAS when prompted

🔧 Temporary Workarounds

Disable DDNS Service

all

Temporarily disable DDNS updates until patching is possible

Use Static IP or VPN

all

Configure network to use static IP addressing or route DDNS traffic through VPN

🧯 If You Can't Patch

  • Segment NAS devices on isolated VLANs to limit attack surface
  • Implement network monitoring for unusual outbound HTTPS connections to DDNS servers

🔍 How to Verify

Check if Vulnerable:

Check ADM version in web interface: Settings > ADM Update > Current Version

Check Version:

ssh admin@nas_ip 'cat /etc/nas.conf | grep version'

Verify Fix Applied:

Verify ADM version is 4.3.4.RGE1 or later (for ADM 4.x) or 5.1.2.RCJ1 or later (for ADM 5.x)

📡 Detection & Monitoring

Log Indicators:

  • Failed TLS certificate validation in system logs
  • Unusual DDNS update patterns

Network Indicators:

  • MITM detection alerts
  • Unusual HTTPS traffic to DDNS servers

SIEM Query:

source="nas_logs" AND ("certificate validation failed" OR "TLS handshake error")

📊 Metadata

CVE ID: CVE-2026-24932
CVSS v3 Score: N/A (Unknown)
CWE: CWE-295
Published: February 3, 2026
Last Updated: February 4, 2026

🤖 AI-assisted analysis, reviewed for accuracy

🔗 References

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