CVE-2025-9252
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys WiFi range extenders allows remote attackers to execute arbitrary code by manipulating the 'hint' parameter in the DisablePasswordAlertRedirect function. This affects multiple RE series models with specific firmware versions. The vulnerability is remotely exploitable and public exploit code exists.
💻 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, persistence, and potential lateral movement to connected networks.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or use the device as part of a botnet.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ 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. Note: No official patch is currently available according to disclosure.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLANs with strict firewall rules.
Access Control
linuxBlock external access to device management interfaces (port 80/443) via firewall.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected devices with non-vulnerable models
- Disable affected devices and use alternative WiFi extension solutions
🔍 How to Verify
Check if Vulnerable:
Access device web interface, navigate to Administration > Firmware Upgrade to check current version.Check Version:
curl -s http://[device-ip]/goform/getStatus | grep firmware_versionVerify Fix Applied:
Verify firmware version is no longer in affected version list after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/DisablePasswordAlertRedirect
- Multiple failed buffer overflow attempts in web logs
Network Indicators:
- Unusual outbound connections from range extender devices
- Traffic to/from device management ports from unexpected sources
SIEM Query:
source="web_logs" AND uri="/goform/DisablePasswordAlertRedirect" AND (hint="*" OR length(hint)>100)