CVE-2025-47187
📋 TL;DR
This vulnerability allows unauthenticated attackers to upload arbitrary WAV files to affected Mitel SIP phones due to missing authentication mechanisms. Attackers could exhaust the phone's storage capacity, potentially disrupting functionality. Affected systems include Mitel 6800 Series, 6900 Series, 6900w Series SIP Phones through 6.4 SP4, and 6970 Conference Unit through specific versions.
💻 Affected Systems
- Mitel 6800 Series SIP Phones
- Mitel 6900 Series SIP Phones
- Mitel 6900w Series SIP Phones
- Mitel 6970 Conference Unit
⚠️ 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 storage exhaustion leading to phone malfunction, inability to receive updates, and potential denial of service for phone features.
Likely Case
Storage consumption affecting phone performance, potentially preventing voicemail storage or configuration changes.
If Mitigated
Minimal impact if network segmentation prevents external access and monitoring detects unusual upload activity.
🎯 Exploit Status
The vulnerability requires no authentication and involves simple file upload mechanisms, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 6.4 SP4 (R6.4.0.4006) for phones; check vendor advisory for 6970 Conference Unit
Vendor Advisory: https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-misa-2025-0004
Restart Required: Yes
Instructions:
1. Review Mitel security advisory MISA-2025-0004. 2. Download appropriate firmware updates from Mitel support portal. 3. Apply updates to affected devices following vendor documentation. 4. Reboot devices after update completion.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SIP phones from untrusted networks to prevent external exploitation
Access Control Lists
allImplement network ACLs to restrict access to phone management interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate phones from untrusted networks
- Deploy network monitoring to detect unusual file upload patterns to phone IPs
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via phone web interface or administrative console. Compare against affected versions listed in advisory.Check Version:
Access phone web interface at http://[phone-ip]/ or use administrative tools to query firmware versionVerify Fix Applied:
Confirm firmware version is updated beyond vulnerable versions and test file upload functionality with authentication requirements.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload activity in phone logs
- Multiple WAV file upload attempts from single source
- Storage capacity alerts from phone systems
Network Indicators:
- HTTP POST requests to phone IPs with WAV file uploads
- Unusual traffic patterns to phone management ports
SIEM Query:
source_ip=* AND dest_ip=[phone_network] AND (http_method=POST AND uri_contains=".wav" OR user_agent_contains="Mitel")