CVE-2025-9483
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys RE series range extenders allows remote attackers to execute arbitrary code by manipulating parameters in the singlePortForwardAdd function. This affects multiple RE model devices running vulnerable firmware versions. Successful exploitation could lead to complete device compromise.
💻 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 full device takeover, persistence installation, and lateral movement to connected networks.
Likely Case
Device compromise allowing attacker to modify configurations, intercept traffic, or use device as pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub, making exploitation trivial for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Check Linksys support website periodically for firmware updates.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/Internet access
Access router admin interface > Administration > Remote Management > Disable
Network Segmentation
allPlace range extenders on isolated VLAN separate from critical infrastructure
🧯 If You Can't Patch
- Replace affected devices with supported models from different vendors
- Implement strict firewall rules blocking all inbound traffic to range extender management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version in device web interface: Login > Administration > Firmware UpgradeCheck Version:
curl -s http://[device-ip]/goform/getSysInfo | grep firmwareVerify Fix Applied:
Verify firmware version is no longer in affected version list📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/singlePortForwardAdd with long parameter values
- Unusual outbound connections from range extender
Network Indicators:
- HTTP requests with abnormally long ruleName/schedule/inboundFilter parameters
- Traffic spikes from range extender to unknown external IPs
SIEM Query:
source="range-extender-logs" AND url="/goform/singlePortForwardAdd" AND (param_length>100 OR status_code=500)🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys/vuln_37/37.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys/vuln_37/37.md#poc
- https://vuldb.com/?ctiid.321398
- https://vuldb.com/?id.321398
- https://vuldb.com/?submit.634823
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys/vuln_37/37.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys/vuln_37/37.md#poc
