Cisco RV Series Authentication Bypass (CVE-2021-1472)
Description
A vulnerability exists in the web-based management interface of Cisco Small Business RV Series routers that allows attackers to bypass authentication controls. Unauthenticated remote attackers can exploit this flaw to upload arbitrary files to restricted directories that normally require administrative privileges. This vulnerability affects the authentication mechanism protecting administrative functions, enabling unauthorized access to sensitive device management capabilities.
Remediation
Apply security updates immediately by upgrading to the latest firmware version provided by Cisco that addresses CVE-2021-1472. Visit the Cisco Security Advisory page or the Cisco Small Business support portal to download the appropriate firmware for your specific RV Series model. Before upgrading, back up your current device configuration. After applying the update, verify the firmware version through the web interface and confirm that authentication controls are functioning properly. If immediate patching is not possible, implement network-level access controls to restrict management interface access to trusted IP addresses only, and disable remote management features until the update can be applied.