CVE-2025-64129
📋 TL;DR
Zenitel TCIV-3+ devices contain an out-of-bounds write vulnerability that allows remote attackers to crash the device through memory corruption. This affects organizations using Zenitel TCIV-3+ intercom systems for security or communication purposes. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Zenitel TCIV-3+
⚠️ 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
Remote code execution leading to complete device compromise, persistent backdoor installation, or device bricking requiring physical replacement.
Likely Case
Denial of service through device crash, disrupting intercom functionality and security communications.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external exploitation.
🎯 Exploit Status
Out-of-bounds write vulnerabilities typically have low exploitation complexity once the memory layout is understood. No public exploit code identified yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Zenitel firmware updates for TCIV-3+
Vendor Advisory: https://wiki.zenitel.com/wiki/Downloads#Station_and_Device_Firmware_Package_.28VS-IS.29
Restart Required: Yes
Instructions:
1. Download latest firmware from Zenitel downloads page. 2. Upload firmware to TCIV-3+ device via web interface. 3. Apply firmware update. 4. Reboot device to complete installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate TCIV-3+ devices from untrusted networks and internet access
Access Control Lists
allImplement firewall rules to restrict access to TCIV-3+ devices
🧯 If You Can't Patch
- Segment TCIV-3+ devices on isolated VLAN with strict firewall rules
- Monitor network traffic to TCIV-3+ devices for anomalous patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or SSH. If version is older than latest release, device is vulnerable.Check Version:
Check via web interface at http://[device-ip]/ or SSH to device and check firmware versionVerify Fix Applied:
Verify firmware version matches latest release from Zenitel downloads page.📡 Detection & Monitoring
Log Indicators:
- Device crash/reboot logs
- Memory access violation errors
- Unusual network connections to device
Network Indicators:
- Malformed packets to TCIV-3+ ports
- Traffic patterns matching exploit attempts
SIEM Query:
source="tciv-3+" AND (event_type="crash" OR event_type="reboot" OR error="memory")