CVE-2026-21418
📋 TL;DR
This CVE describes an OS command injection vulnerability in Dell Unity storage systems. A low-privileged attacker with local access can execute arbitrary commands with root privileges, potentially gaining full control of the system. Affected systems include Dell Unity, UnityVSA, and Unity XT versions 5.5.2 and earlier.
💻 Affected Systems
- Dell Unity
- Dell UnityVSA
- Dell Unity XT
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, allowing data theft, system destruction, or lateral movement to other network resources.
Likely Case
Privilege escalation from low-privileged user to root, enabling installation of persistent backdoors, data exfiltration, or service disruption.
If Mitigated
Limited impact if proper network segmentation, least privilege access controls, and monitoring are implemented to detect and contain exploitation attempts.
🎯 Exploit Status
Exploitation requires authenticated local access but is straightforward once access is obtained. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 5.5.3 or later
Restart Required: Yes
Instructions:
1. Download the latest firmware update from Dell Support. 2. Follow Dell Unity OS upgrade procedures. 3. Apply the update through the Unity management interface. 4. Reboot the system as required.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local console and SSH access to only necessary administrative personnel using strict access controls.
Implement Least Privilege
allRemove unnecessary local user accounts and ensure remaining accounts have minimal required privileges.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Dell Unity systems from other critical infrastructure
- Enable detailed logging and monitoring for suspicious command execution and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check system version via Unity management interface or SSH: 'show version' commandCheck Version:
show versionVerify Fix Applied:
Verify system version is 5.5.3 or later using 'show version' command📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- Privilege escalation attempts
- Suspicious process creation by low-privileged users
Network Indicators:
- Unexpected outbound connections from Unity systems
- Anomalous SSH or console login patterns
SIEM Query:
source="dell-unity-logs" AND (event_type="command_execution" OR user_privilege_change="escalation")