CVE-2025-26489
📋 TL;DR
This vulnerability allows remote authenticated users to send specially crafted XML payloads to the Netconf service in Infinera MTC-9 appliances, causing a denial of service through service crashes and device reboots. It affects MTC-9 appliances running specific firmware versions. Only authenticated users can exploit this vulnerability.
💻 Affected Systems
- Infinera MTC-9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption with repeated reboots preventing normal operation, potentially requiring manual intervention to restore service.
Likely Case
Temporary service outages and reboots causing operational disruption until the device restarts and services resume.
If Mitigated
Limited impact with proper network segmentation and access controls preventing unauthorized access to Netconf service.
🎯 Exploit Status
Requires authentication to Netconf service and ability to send crafted XML payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R23.0 or later
Vendor Advisory: https://www.cve.org/CVERecord?id=CVE-2025-26489
Restart Required: Yes
Instructions:
1. Download R23.0 or later firmware from Infinera support portal. 2. Backup current configuration. 3. Apply firmware update following vendor documentation. 4. Verify successful update and restore configuration if needed.
🔧 Temporary Workarounds
Restrict Netconf Access
allLimit access to Netconf service using firewall rules and network segmentation.
iptables -A INPUT -p tcp --dport 830 -s trusted_networks -j ACCEPT
iptables -A INPUT -p tcp --dport 830 -j DROP
Disable Netconf Service
linuxTemporarily disable Netconf service if not required for operations.
systemctl stop netconf-service
systemctl disable netconf-service
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MTC-9 appliances from untrusted networks
- Enforce strong authentication policies and monitor for suspicious Netconf access patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version via CLI: show version | include SoftwareCheck Version:
show version | include SoftwareVerify Fix Applied:
Verify firmware version is R23.0 or later: show version | include Software📡 Detection & Monitoring
Log Indicators:
- Unexpected service restarts
- Netconf service crash logs
- Multiple authentication attempts to Netconf
Network Indicators:
- Unusual XML payloads to port 830
- Multiple connection attempts to Netconf service
SIEM Query:
source="mtc9-logs" AND ("service restart" OR "netconf crash" OR "port 830" AND "XML")