CVE-2025-9250
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys RE series range extenders allows remote attackers to execute arbitrary code by manipulating the 'hint' parameter in the setPWDbyBBS function. This affects multiple RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 models running vulnerable firmware versions. Attackers can exploit this remotely without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Linksys RE6250
- Linksys RE6300
- Linksys RE6350
- Linksys RE6500
- Linksys RE7000
- Linksys RE9000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to other network devices, and data exfiltration.
Likely Case
Device takeover enabling network reconnaissance, credential harvesting, and use as pivot point for further attacks.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict network segmentation and egress filtering.
🎯 Exploit Status
Public exploit code available on GitHub. Attack requires network access to device management interface (typically port 80/443).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.linksys.com/
Restart Required: Yes
Instructions:
1. Check Linksys website for firmware updates. 2. If update available, download and install via web interface. 3. Reboot device after update. 4. Verify firmware version is no longer vulnerable.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface or restrict access to trusted IPs only
Network segmentation
allPlace range extenders in isolated VLAN separate from critical assets
🧯 If You Can't Patch
- Immediately disconnect vulnerable devices from network
- Replace with different models or brands that are not affected
🔍 How to Verify
Check if Vulnerable:
Access device web interface, navigate to Administration > Firmware Upgrade, check current firmware version against vulnerable list.Check Version:
curl -s http://[device-ip]/goform/getSysInfo | grep firmwareVerify Fix Applied:
After firmware update, verify version is different from vulnerable versions listed.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setPWDbyBBS with long hint parameters
- Unusual process execution or system reboots
Network Indicators:
- HTTP POST requests to /goform/setPWDbyBBS with unusually long parameters
- Outbound connections from range extenders to unknown IPs
SIEM Query:
source="firewall" AND (url="/goform/setPWDbyBBS" AND content_length>1000)