#VU56020 Stack-based buffer overflow in Cisco Systems, Inc products - CVE-2021-34730
Published: August 22, 2021 / Updated: September 30, 2021
RV110W Wireless-N VPN Firewall
RV130W Wireless-N Multifunction VPN Router
Cisco Small Business RV130 Series VPN Routers
RV215W Wireless-N VPN Router
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the Universal Plug-and-Play (UPnP) service. A remote unauthenticated attacker can send a specially crafted UPnP request to an affected device, trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Cisco is not planning to release any security updates for the affected devices, as they have reached the end-of-life status.
As a workaround it is recommended to disable UPnP.
To disable UPnP on the LAN interface of a device, do the following:
- Open the web-based management interface and choose Basic Settings > UPnP.
- Check the Disable check box.