CVE-2025-8828
📋 TL;DR
This CVE describes an OS command injection vulnerability in Linksys WiFi range extenders that allows remote attackers to execute arbitrary commands on affected devices. The vulnerability exists in the ipv6cmd function when processing multiple IPv6 configuration parameters. All Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices with firmware up to August 1, 2025 are affected.
💻 Affected Systems
- Linksys RE6250
- Linksys RE6300
- Linksys RE6350
- Linksys RE6500
- Linksys RE7000
- Linksys RE9000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, pivot to internal networks, or use device as botnet node.
Likely Case
Remote code execution leading to device takeover, network traffic interception, or denial of service.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Proof of concept available on GitHub. Remote exploitation without authentication is confirmed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - vendor did not respond to disclosure
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Check Linksys support site periodically for firmware updates.
🔧 Temporary Workarounds
Disable IPv6 Configuration Web Interface
allDisable or restrict access to the IPv6 configuration interface to prevent exploitation.
Network Segmentation
allPlace affected devices on isolated VLANs with strict firewall rules preventing external access.
🧯 If You Can't Patch
- Isolate affected devices from internet with strict inbound firewall rules
- Disable IPv6 functionality if not required for network operations
- Implement network monitoring for unusual traffic patterns from these devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at http://[device-ip]/ or using admin console. If version is 20250801 or earlier, device is vulnerable.Check Version:
curl -s http://[device-ip]/ | grep -i firmware || Check web interface manuallyVerify Fix Applied:
No official fix available to verify. Monitor Linksys for firmware updates.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setIpv6 with shell metacharacters
- Unexpected process execution from web interface
- Failed authentication attempts to device admin interface
Network Indicators:
- Unusual outbound connections from range extenders
- Traffic to unexpected ports from device IPs
- Spike in HTTP requests to device management interface
SIEM Query:
source="*linksys*" AND (uri_path="/goform/setIpv6" AND (request_body="*;*" OR request_body="*|*" OR request_body="*`*"))🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_44/44.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_44/44.md#poc
- https://vuldb.com/?ctiid.319362
- https://vuldb.com/?id.319362
- https://vuldb.com/?submit.626693
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_44/44.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_44/44.md#poc
