CVE-2022-20707
📋 TL;DR
This critical vulnerability in Cisco Small Business RV Series routers allows unauthenticated attackers to bypass authentication, execute arbitrary commands with root privileges, and potentially take full control of affected devices. It affects RV160, RV260, RV340, and RV345 series routers running vulnerable firmware versions. Organizations using these routers for network connectivity are at immediate risk.
💻 Affected Systems
- Cisco RV160
- Cisco RV260
- Cisco RV340
- Cisco RV345
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to intercept all network traffic, install persistent backdoors, pivot to internal networks, and cause permanent device damage.
Likely Case
Unauthenticated remote code execution leading to router takeover, credential theft, network monitoring, and denial of service.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation, though lateral movement risk remains.
🎯 Exploit Status
Public exploit code available on Packet Storm and other sources. Multiple proof-of-concepts demonstrate authentication bypass and command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.01.02 and later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-mult-vuln-KA9PK6D
Restart Required: Yes
Instructions:
1. Download firmware version 1.0.01.02 or later from Cisco website. 2. Log into router web interface. 3. Navigate to Administration > Firmware Upgrade. 4. Upload and install new firmware. 5. Reboot router after installation completes.
🔧 Temporary Workarounds
Disable WAN Management
allPrevents external exploitation by disabling remote management interfaces
Navigate to Firewall > Basic Settings > Disable 'Remote Management'
Restrict Management Access
allLimit management interface access to specific IP addresses only
Navigate to Firewall > Access Rules > Create rule restricting port 443/80 to trusted IPs
🧯 If You Can't Patch
- Immediately isolate affected routers from internet by placing behind firewall with strict inbound rules
- Implement network segmentation to limit lateral movement if router is compromised
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: System Summary > Firmware Version. If version is below 1.0.01.02, device is vulnerable.Check Version:
No CLI command available. Must check via web interface at System Summary page.Verify Fix Applied:
After patching, verify firmware version shows 1.0.01.02 or higher in System Summary.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to web interface
- Unexpected configuration changes
- Unusual command execution in system logs
Network Indicators:
- Unusual outbound connections from router
- Traffic redirection patterns
- Unexpected SSH/Telnet connections from router
SIEM Query:
source="cisco-router" AND (event_type="authentication_failure" OR event_type="configuration_change") AND NOT src_ip IN [trusted_management_ips]🔗 References
- http://packetstormsecurity.com/files/170988/Cisco-RV-Series-Authentication-Bypass-Command-Injection.html
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-mult-vuln-KA9PK6D
- https://www.zerodayinitiative.com/advisories/ZDI-22-409/
- https://www.zerodayinitiative.com/advisories/ZDI-22-411/
- https://www.zerodayinitiative.com/advisories/ZDI-22-419/
- http://packetstormsecurity.com/files/170988/Cisco-RV-Series-Authentication-Bypass-Command-Injection.html
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-mult-vuln-KA9PK6D
- https://www.zerodayinitiative.com/advisories/ZDI-22-409/
- https://www.zerodayinitiative.com/advisories/ZDI-22-411/
- https://www.zerodayinitiative.com/advisories/ZDI-22-419/
