CVE-2021-34730: Cisco Application Extension Platform

Critical severity, CVSS 9.8. EPSS: 18.5% chance of exploitation in the next 30 days.

A vulnerability in the Universal Plug-and-Play (UPnP) service of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an unauthenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of incoming UPnP traffic. An attacker could exploit this vulnerability by sending a crafted UPnP request to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a DoS condition. Cisco has not released software updates that address this vulnerability.

Affected products

• Cisco Application Extension Platform: version 1.0.3.55 only
• Cisco RV110W Wireless-N VPN Firewall Firmware: affected versions not specified
• Cisco RV130 VPN Router Firmware: affected versions not specified
• Cisco RV130W Wireless-N Multifunction VPN Router Firmware: affected versions not specified
• Cisco RV215W Wireless-N VPN Router Firmware: affected versions not specified

Published 2021-08-18. Last modified 2026-06-17.