CVE-2025-25527
📋 TL;DR
A buffer overflow vulnerability in Ruijie RG-NBR2600S Gateway allows attackers to crash the device or execute arbitrary commands by exploiting insufficient length verification in source address NAT rule configuration. This affects organizations using the vulnerable gateway version. Successful exploitation requires network access to the device's management interface.
💻 Affected Systems
- Ruijie RG-NBR2600S Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network disruption, and potential lateral movement into internal networks.
Likely Case
Device crash causing network outage and denial of service for connected users and services.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Public proof-of-concept code exists in the GitHub gist reference. Exploitation appears straightforward for attackers with network access to the management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown - no vendor advisory found at time of analysis
Restart Required: Yes
Instructions:
1. Check Ruijie official website for security advisories. 2. If patch available, download firmware update. 3. Backup current configuration. 4. Apply firmware update via web interface or CLI. 5. Reboot device. 6. Verify new firmware version.
🔧 Temporary Workarounds
Restrict Management Access
allLimit access to device management interface to trusted IP addresses only
configure terminal
access-list 10 permit 192.168.1.0 0.0.0.255
line vty 0 4
access-class 10 in
Disable Unused NAT Rules
allRemove or disable source address NAT rules that are not required
configure terminal
no ip nat inside source list 1 interface GigabitEthernet0/0 overload
🧯 If You Can't Patch
- Isolate vulnerable device in separate VLAN with strict firewall rules
- Implement network monitoring and intrusion detection for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI command 'show version' and verify if running 10.3(4b12)Check Version:
show version | include VersionVerify Fix Applied:
After applying any workaround, test NAT rule configuration with malformed inputs to verify device stability📡 Detection & Monitoring
Log Indicators:
- Device crash/reboot logs
- Memory access violation errors
- Unusual NAT configuration changes
Network Indicators:
- Multiple malformed packets to management interface port
- Sudden device unresponsiveness
SIEM Query:
source="ruijie-gateway" AND (event_type="crash" OR event_type="memory_error" OR message="*buffer*overflow*")