CVE-2025-60691
📋 TL;DR
A stack-based buffer overflow vulnerability in Linksys E1200 v2 routers allows remote attackers to execute arbitrary code or cause denial of service without authentication. Attackers can exploit this by sending crafted HTTP requests to the vulnerable httpd binary. All users of Linksys E1200 v2 routers with the affected firmware are at risk.
💻 Affected Systems
- Linksys E1200 v2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Denial of service causing router crashes and network disruption, potentially leading to remote code execution in targeted attacks.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Public GitHub repository contains analysis and likely exploit code. The vulnerability is straightforward to exploit due to lack of bounds checking.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.linksys.com/
Restart Required: Yes
Instructions:
1. Check Linksys website for firmware updates. 2. Download latest firmware for E1200 v2. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router web interface
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement strict network firewall rules to block all HTTP traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Administration > Firmware UpgradeCheck Version:
curl -s http://router-ip/status.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is newer than E1200_v2.0.11.001_us.tar.gz📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to CGI endpoints
- Router crash/restart logs
- Large or malformed URL parameters in web logs
Network Indicators:
- HTTP requests with unusually long URL parameters to router IP
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="router.log" AND (url="*apply.cgi*" OR url="*block.cgi*") AND url_length>100