CVE-2022-20825
📋 TL;DR
An unauthenticated remote attacker can execute arbitrary code with root privileges on affected Cisco Small Business routers by sending crafted HTTP requests to the web management interface. This vulnerability affects RV110W, RV130, RV130W, and RV215W routers due to insufficient input validation. Successful exploitation allows complete device compromise or denial of service.
💻 Affected Systems
- Cisco RV110W Wireless-N VPN Firewall
- Cisco RV130 VPN Router
- Cisco RV130W Wireless-N Multifunction VPN Router
- Cisco RV215W Wireless-N VPN Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover with root-level command execution, allowing attacker to install persistent malware, intercept all network traffic, pivot to internal networks, or permanently brick the device.
Likely Case
Remote code execution leading to device compromise, credential theft, network traffic interception, and potential lateral movement to connected systems.
If Mitigated
Denial of service from device reboot if exploit attempts fail or are partially successful, causing temporary network disruption.
🎯 Exploit Status
Exploitation requires sending crafted HTTP packets to the management interface. No authentication required, making this easily exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv-overflow-s2r82P9v
Restart Required: No
Instructions:
No official patch available. Cisco has not released software updates. Consider workarounds or device replacement.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web-based management interface to prevent remote exploitation.
Access router CLI via SSH/Telnet
Navigate to configuration mode
Disable HTTP/HTTPS management service
Restrict Management Access
allLimit web management interface access to specific trusted IP addresses only.
Configure firewall rules to allow management access only from trusted IPs
Disable remote management if not required
🧯 If You Can't Patch
- Replace affected routers with supported models that receive security updates
- Segment affected routers in isolated network zones with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check if you have affected Cisco RV model routers with web management interface exposed.Check Version:
Login to router web interface or CLI and check model/version in system informationVerify Fix Applied:
Verify web management interface is disabled or inaccessible from untrusted networks.📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP requests to management interface
- Unusual HTTP request patterns with malformed packets
- Device reboot logs without normal cause
Network Indicators:
- HTTP traffic to router management port (typically 80/443) from unexpected sources
- Unusual outbound connections from router after exploitation
SIEM Query:
source_ip=* AND dest_port IN (80,443) AND dest_ip=[router_ip] AND http_user_agent CONTAINS 'malicious' OR http_request_size > [threshold]