CVE-2025-56007
📋 TL;DR
This CRLF injection vulnerability in KeeneticOS allows attackers to add unauthorized administrative users by tricking victims into visiting a malicious page. It affects Keenetic routers running versions before 4.3. Attackers can gain full control of the device through this web API flaw.
💻 Affected Systems
- Keenetic routers
📦 What is this software?
Keeneticos by Keenetic
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover with administrative privileges, allowing attackers to reconfigure network settings, intercept traffic, or use the device as a pivot point into internal networks.
Likely Case
Unauthorized administrative user creation leading to persistent access, network monitoring, or device configuration changes.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation attempts.
🎯 Exploit Status
Requires user interaction (victim visiting malicious page). CRLF injection at /auth endpoint enables privilege escalation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: KeeneticOS 4.3 or later
Vendor Advisory: https://keenetic.com/global/security#october-2025-web-api-vulnerabilities
Restart Required: No
Instructions:
1. Log into Keenetic router web interface
2. Navigate to System > Firmware Update
3. Check for and install KeeneticOS 4.3 or later
4. Verify update completes successfully
🔧 Temporary Workarounds
Disable web interface external access
allPrevent external access to the web management interface
Navigate to System > Remote Access > Disable 'Allow access from Internet'
Restrict web interface access
allLimit web interface access to trusted IP addresses only
Navigate to System > Remote Access > Configure IP restrictions
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Keenetic devices from untrusted networks
- Deploy web application firewall rules to detect and block CRLF injection attempts at /auth endpoint
🔍 How to Verify
Check if Vulnerable:
Check KeeneticOS version in web interface under System > About. If version is below 4.3, device is vulnerable.Check Version:
ssh admin@router-ip show versionVerify Fix Applied:
Confirm KeeneticOS version is 4.3 or higher in System > About. Test /auth endpoint with controlled CRLF injection attempt.📡 Detection & Monitoring
Log Indicators:
- Unusual user creation events
- Multiple failed authentication attempts followed by successful user creation
- Access to /auth endpoint with unusual parameters
Network Indicators:
- HTTP requests to /auth endpoint containing CRLF sequences
- Traffic patterns suggesting user interaction with malicious pages
SIEM Query:
source="keenetic" AND (uri_path="/auth" AND (request_contains="%0D%0A" OR request_contains="%0A" OR request_contains="%0D"))