CVE-2025-4354
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda DAP-1520 routers allows remote attackers to execute arbitrary code by manipulating the check_dws_cookie function. This affects users running firmware version 1.10B04_BETA02. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda DAP-1520
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, and lateral movement into connected networks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and network segmentation.
🎯 Exploit Status
Public exploit code exists in GitHub repository, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Upload and install new firmware. 5. Reboot router.
🔧 Temporary Workarounds
Network Isolation
allPlace vulnerable routers behind firewalls with strict inbound rules
Access Restriction
allDisable remote administration and restrict management interface access
🧯 If You Can't Patch
- Replace vulnerable devices with patched or different model routers
- Implement network segmentation to isolate vulnerable routers from critical assets
🔍 How to Verify
Check if Vulnerable:
Access router admin interface and check firmware version matches 1.10B04_BETA02Check Version:
Check router web interface or use nmap -sV to identify firmware versionVerify Fix Applied:
Verify firmware version has been updated to a newer release than 1.10B04_BETA02📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to router management interface
- Multiple failed requests to /storage endpoint
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting router compromise
SIEM Query:
source_ip="router_ip" AND (uri_path="/storage" OR user_agent="exploit")