CVE-2021-1360
📋 TL;DR
This vulnerability allows authenticated remote attackers to execute arbitrary code as root or cause denial of service on affected Cisco Small Business routers. Attackers need valid administrator credentials to exploit these input validation flaws in the web management interface. Organizations using Cisco RV110W, RV130, RV130W, or RV215W routers are affected.
💻 Affected Systems
- Cisco Small Business RV110W Router
- Cisco Small Business RV130 Router
- Cisco Small Business RV130W Router
- Cisco Small Business RV215W Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root-level arbitrary code execution leading to complete device control, data exfiltration, and persistent backdoor installation.
Likely Case
Device reboot causing temporary service disruption, or limited code execution for reconnaissance and lateral movement within the network.
If Mitigated
No impact if proper credential management and network segmentation prevent attackers from reaching the management interface.
🎯 Exploit Status
Exploitation requires valid admin credentials but involves simple HTTP request crafting. No public exploit code is documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-overflow-WUnUgv4U
Restart Required: No
Instructions:
Cisco has not released software updates. Consider workarounds or device replacement.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the vulnerable web-based management interface and use alternative management methods.
Restrict Management Access
allLimit access to the management interface to trusted IP addresses only using ACLs.
🧯 If You Can't Patch
- Replace affected devices with supported models that receive security updates.
- Implement strict network segmentation to isolate affected routers from critical assets.
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version via web interface or CLI. All RV110W, RV130, RV130W, RV215W routers are vulnerable.Check Version:
show version (CLI) or check System Information in web interfaceVerify Fix Applied:
No fix available. Verify workarounds by confirming web interface is disabled or access is restricted.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login
- Unusual HTTP POST requests to management endpoints
- Device reboot logs without scheduled maintenance
Network Indicators:
- HTTP traffic to router management interface from unexpected sources
- Unusual outbound connections from router after management access
SIEM Query:
source="router_logs" (event="authentication success" AND user="admin") OR (event="device reboot" AND NOT maintenance)