CVE-2025-8832
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys WiFi range extenders allows remote attackers to execute arbitrary code by manipulating the DMZIPAddress parameter. 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, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Device takeover for credential theft, DNS hijacking, man-in-the-middle attacks, or denial of service against the range extender.
If Mitigated
Limited to denial of service if exploit fails or if network segmentation prevents lateral movement.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. The vulnerability requires no authentication and has simple exploitation steps.
🛠️ 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 the web administration interface
Access web interface > Administration > Remote Management > Disable
Network Segmentation
allIsolate range extenders on separate VLAN from critical systems
🧯 If You Can't Patch
- Replace vulnerable devices with patched or different models
- Implement strict firewall rules blocking all inbound traffic to range extender management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: Settings > Firmware Update > Current Version. If version date is 20250801 or earlier, device is vulnerable.Check Version:
curl -s http://[device-ip]/goform/getSysInfo | grep firmwareVerify Fix Applied:
Verify firmware version shows date after 20250801. Test by attempting to access /goform/setDMZ with malformed input (in controlled environment).📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setDMZ
- Unusual long DMZIPAddress parameter values
- Device reboot or crash logs
Network Indicators:
- HTTP POST to /goform/setDMZ with oversized DMZIPAddress parameter
- Unusual outbound connections from range extender
SIEM Query:
source="linksys-extender" AND url="/goform/setDMZ" AND content_length>100🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_48/48.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_48/48.md#poc
- https://vuldb.com/?ctiid.319366
- https://vuldb.com/?id.319366
- https://vuldb.com/?submit.626697
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_48/48.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_48/48.md#poc
