CVE-2025-8830
📋 TL;DR
This CVE describes a remote command injection vulnerability in multiple Linksys RE-series range extenders. Attackers can execute arbitrary operating system commands by manipulating the Hostname parameter in the /goform/setWan endpoint. All users of affected Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices with firmware up to August 1, 2025 are vulnerable.
💻 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 attackers to install persistent backdoors, pivot to internal networks, steal credentials, or use the device for botnet participation.
Likely Case
Attackers gain shell access to execute commands, potentially modifying device configuration, intercepting traffic, or disabling the device.
If Mitigated
With proper network segmentation and access controls, impact is limited to the compromised device only.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. Exploitation requires sending a crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch is available as the vendor has not responded. Check Linksys support website periodically for firmware updates addressing CVE-2025-8830.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable remote web management access to prevent exploitation of the vulnerable endpoint
Access device settings → Administration → Remote Management → Disable
Network Segmentation
allIsolate range extenders on separate VLANs to limit lateral movement if compromised
🧯 If You Can't Patch
- Replace vulnerable devices with models from different vendors that receive security updates
- Implement strict network access controls to limit communication with range extender management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version in device web interface. If version date is 20250801 or earlier, device is vulnerable.Check Version:
Check via web interface: Status → Firmware Version or via SSH if enabled: cat /proc/versionVerify Fix Applied:
No verification possible until vendor releases patched firmware. Monitor Linksys security advisories.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/setWan with shell metacharacters in parameters
- Multiple failed login attempts followed by successful command execution patterns
Network Indicators:
- Unusual outbound connections from range extenders
- Traffic to known malicious IPs originating from range extenders
SIEM Query:
source="linksys-extender" AND (url="/goform/setWan" AND (param="Hostname" AND value MATCHES "[;&|`$()]"))🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_46/46.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_46/46.md#poc
- https://vuldb.com/?ctiid.319364
- https://vuldb.com/?id.319364
- https://vuldb.com/?submit.626695
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_46/46.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_46/46.md#poc
