CVE-2025-27827
📋 TL;DR
An information disclosure vulnerability in Mitel MiContact Center Business's legacy chat component allows unauthenticated attackers to access sensitive session data through user interaction. This could lead to unauthorized access to active chat rooms, reading chat data, and sending messages during active sessions. Organizations using MiContact Center Business through version 10.2.0.3 are affected.
💻 Affected Systems
- Mitel MiContact Center Business
⚠️ 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
Attackers gain full access to active chat sessions, read sensitive customer data, impersonate agents, and potentially pivot to other systems using stolen session information.
Likely Case
Unauthorized reading of chat conversations containing personal information, customer data, or internal communications.
If Mitigated
Limited exposure with proper network segmentation and monitoring, potentially only affecting isolated chat sessions.
🎯 Exploit Status
Exploitation requires user interaction but no authentication. Attackers need to trick users into performing specific actions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.2.0.4 or later
Vendor Advisory: https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-misa-2025-0002-0
Restart Required: Yes
Instructions:
1. Download patch from Mitel support portal. 2. Backup current configuration. 3. Apply patch following vendor instructions. 4. Restart MiContact Center services. 5. Verify chat functionality.
🔧 Temporary Workarounds
Disable Legacy Chat Component
allTemporarily disable the vulnerable legacy chat component until patching can be completed.
Refer to Mitel documentation for component-specific disable procedures
Network Segmentation
allRestrict access to chat component to internal networks only.
firewall rules to block external access to chat ports
🧯 If You Can't Patch
- Implement strict network segmentation to isolate chat component from internet access
- Enable detailed logging and monitoring for chat session anomalies
🔍 How to Verify
Check if Vulnerable:
Check MiContact Center Business version via admin console. If version is 10.2.0.3 or earlier, system is vulnerable.Check Version:
Check version in MiContact Center Business administration interfaceVerify Fix Applied:
Verify version is 10.2.0.4 or later in admin console and test chat functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual chat session access patterns
- Multiple failed authentication attempts on chat component
- Chat sessions from unexpected IP addresses
Network Indicators:
- Unusual traffic to chat component ports
- Chat protocol anomalies
- Session hijacking patterns
SIEM Query:
source="micontact" AND (event_type="chat_session" OR event_type="authentication") AND (status="unusual" OR ip_address NOT IN allowed_ips)