CVE-2025-8824
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys WiFi range extenders allows remote attackers to execute arbitrary code by manipulating RIPmode/RIPpasswd parameters. This affects Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices with firmware up to August 1, 2025. Attackers can exploit this 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 traffic interception, DNS hijacking, credential theft, and participation in botnets.
If Mitigated
Denial of service or device instability if exploit fails or controls limit impact.
🎯 Exploit Status
Public proof-of-concept available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check Linksys support website for firmware updates. 2. If update available, download and install via web interface. 3. Reboot device after installation. 4. Verify firmware version is newer than 20250801.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to vulnerable web interface
Access router admin interface > Administration > Remote Management > Disable
Network segmentation
allIsolate range extenders on separate VLAN
🧯 If You Can't Patch
- Immediately disconnect affected devices from internet and production networks
- Replace with non-vulnerable hardware if patches remain unavailable
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at http://[device-ip]/ or using admin interface. If version date is 20250801 or earlier, device is vulnerable.Check Version:
curl -s http://[device-ip]/ | grep -i firmwareVerify Fix Applied:
Verify firmware version shows date after 20250801 and test if /goform/setRIP endpoint rejects malformed RIPmode/RIPpasswd inputs.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setRIP with long parameter values
- Device reboot logs after suspicious requests
- Unusual outbound connections from range extender
Network Indicators:
- HTTP traffic to device IP on port 80 with POST to /goform/setRIP
- Unusual traffic patterns from range extender to external IPs
SIEM Query:
source="network_firewall" AND (url="/goform/setRIP" OR dest_port=80 AND http_method="POST" AND url CONTAINS "setRIP")🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_40/40.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_40/40.md#poc
- https://vuldb.com/?ctiid.319358
- https://vuldb.com/?id.319358
- https://vuldb.com/?submit.626689
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_40/40.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_40/40.md#poc
