CVE-2020-28695
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code and retrieve admin credentials on Askey Fiber Router RTF3505VW-N1 devices. Attackers can gain root access through the dashboard or SSH, potentially taking full control of affected routers. Users of these specific Askey router models are affected.
💻 Affected Systems
- Askey Fiber Router RTF3505VW-N1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with root access, allowing attackers to intercept all network traffic, deploy malware to connected devices, and use the router as a pivot point into internal networks.
Likely Case
Router takeover leading to credential theft, DNS hijacking, and network surveillance of connected devices.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and strong network segmentation.
🎯 Exploit Status
Public exploit details available in referenced Medium article; remote code execution and credential retrieval are documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check with Askey for firmware updates or consider router replacement.
🔧 Temporary Workarounds
Disable Remote Management
allTurn off remote administration features to prevent external exploitation
Network Segmentation
allIsolate router management interface from general network access
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict firewall rules blocking all external access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version matches BR_SV_g000_R3505VWN1001_s32_7, device is vulnerable.Check Version:
Login to router admin interface and check firmware version in system settings.Verify Fix Applied:
Verify firmware has been updated to a version not listed as vulnerable; no known patched version exists.📡 Detection & Monitoring
Log Indicators:
- Unusual SSH login attempts
- Unexpected configuration changes
- Suspicious command execution in router logs
Network Indicators:
- Unexpected outbound connections from router
- DNS changes not initiated by administrator
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (event="authentication_failure" OR event="configuration_change")