CVE-2023-20117
📋 TL;DR
Authenticated remote attackers can execute arbitrary commands as root on Cisco RV320/RV325 routers via web interface input validation flaws. This affects administrators of these specific Cisco Small Business VPN routers. Attackers need valid admin credentials to exploit these vulnerabilities.
💻 Affected Systems
- Cisco Small Business RV320 Dual Gigabit WAN VPN Router
- Cisco Small Business RV325 Dual Gigabit WAN VPN Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to reconfigure network, intercept traffic, install persistent backdoors, or use device as pivot point into internal network.
Likely Case
Attacker with stolen or compromised admin credentials gains full control of router, potentially disrupting network operations or stealing sensitive data.
If Mitigated
With strong admin credentials and network segmentation, impact limited to single device compromise without lateral movement.
🎯 Exploit Status
Exploitation requires valid admin credentials but is straightforward once credentials are obtained. No public exploit code identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv32x-cmdinject-cKQsZpxL
Restart Required: No
Instructions:
No official patch available. Cisco has not released software updates. Consider workarounds or replacement.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the web-based management interface to prevent exploitation vectors
Use CLI or disable via console if available
Restrict Management Access
allLimit management interface access to specific trusted IP addresses only
Configure firewall rules to restrict access to management IP/port
🧯 If You Can't Patch
- Replace affected devices with supported models that receive security updates
- Implement network segmentation to isolate affected routers from critical systems
🔍 How to Verify
Check if Vulnerable:
Check if device is Cisco RV320 or RV325 model via web interface or CLICheck Version:
Check web interface or use 'show version' in CLIVerify Fix Applied:
No fix available to verify. Verify workarounds by testing management interface accessibility.📡 Detection & Monitoring
Log Indicators:
- Unusual admin login attempts
- Unexpected configuration changes
- Suspicious command execution in logs
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
SIEM Query:
source="router_logs" AND (event="admin_login" OR event="config_change") AND user!="expected_admin"