Cisco RV110W, RV130W, and RV215W Routers Management Interface Denial of Service Vulnerability

Vulnerability

The vulnerability exists in the web-based management interface of the Cisco RV110W Wireless-N VPN Firewall, RV130W Wireless-N Multifunction VPN Router, and RV215W Wireless-N VPN Router. The issue is improper validation of user-supplied data in the web interface. An unauthenticated, remote attacker can exploit this by sending specially crafted HTTP requests to a targeted device. Affected versions: as per Cisco advisory, all firmware versions prior to the fixed releases. [1]

Exploitation

An attacker needs only network access to the target device; no authentication is required. The attacker sends malicious HTTP requests to the web management interface. The improper validation leads to a condition that causes the device to reload. The steps: identify a vulnerable device, craft HTTP requests with malformed data, send them to the interface, triggering a reload. No user interaction or race condition needed. [1]

Impact

Successful exploitation causes the device to reload, resulting in a denial of service (DoS) condition. The attacker gains no access to data or privileged operations; the impact is solely availability disruption. The device becomes temporarily unavailable until it completes the reload cycle. [1]

Mitigation

Cisco has released free software updates that address this vulnerability. Customers may install updates for their licensed devices. The fixed releases are specified in the advisory. Customers without service contracts should contact Cisco TAC to obtain upgrades. Workarounds: none disclosed. Ensure devices are updated to the latest firmware. [1]