CVE-2023-20128
📋 TL;DR
Authenticated remote attackers can execute arbitrary commands as root on Cisco RV320/RV325 routers via the web management interface. This affects administrators with valid credentials. No patches are available from Cisco.
💻 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
Full device compromise allowing attacker to reconfigure network, intercept traffic, install persistent backdoors, or pivot to internal networks.
Likely Case
Attackers with stolen admin credentials gain complete control over affected routers to modify configurations or deploy malware.
If Mitigated
With strong credential protection and network segmentation, impact limited to isolated router compromise.
🎯 Exploit Status
Exploitation requires valid admin credentials but is straightforward once obtained.
🛠️ 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 exists. Consider workarounds or replacement.
🔧 Temporary Workarounds
Disable web management interface
allPrevent access to vulnerable interface by disabling HTTP/HTTPS management
Use CLI: no ip http server
no ip http secure-server
Restrict management access
allLimit management interface to trusted IP addresses only
Configure ACL: access-list 1 permit [trusted-ip]
ip http access-class 1
🧯 If You Can't Patch
- Replace affected devices with supported models
- Implement strict network segmentation to isolate routers
🔍 How to Verify
Check if Vulnerable:
Check if device is RV320/RV325 model and has web management enabledCheck Version:
show versionVerify Fix Applied:
Verify web interface is disabled or access is restricted via ACL📡 Detection & Monitoring
Log Indicators:
- Unusual admin login attempts
- Configuration changes from unexpected sources
- Command execution in web interface 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"