CVE-2022-25074
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary code on TP-Link TL-WR902AC routers due to a stack overflow in the DM_Fillobjbystr() function. Attackers can remotely compromise affected routers without authentication. Only TP-Link TL-WR902AC V3 routers with firmware version 191209 are affected.
💻 Affected Systems
- TP-Link TL-WR902AC
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to intercept traffic, modify configurations, install persistent malware, and pivot to internal networks.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and botnet recruitment.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code exists in GitHub repositories. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check TP-Link support for firmware updates. 2. If update available, download from official TP-Link site. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers in isolated network segments with strict firewall rules
Disable Remote Management
allTurn off WAN-side administration access to prevent external exploitation
🧯 If You Can't Patch
- Replace affected routers with patched or different models
- Implement strict network segmentation and firewall rules to limit router exposure
🔍 How to Verify
Check if Vulnerable:
Check router web interface for model TL-WR902AC V3 and firmware version 191209Check Version:
Check router admin interface at 192.168.0.1 or 192.168.1.1 under System Tools > Firmware UpgradeVerify Fix Applied:
Verify firmware version has changed from 191209 to a newer version📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to router admin interface
- Unexpected firmware modification logs
- Abnormal network traffic patterns from router
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Port scanning originating from router
SIEM Query:
source_ip=router_ip AND (event_type="firmware_change" OR auth_failures > 5)