CVE-2020-3358: Cisco RV340 Dual WAN Gigabit VPN Router Firmware

High severity, CVSS 8.6. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability in the Secure Sockets Layer (SSL) VPN feature for Cisco Small Business RV VPN Routers could allow an unauthenticated, remote attacker to cause the device to unexpectedly restart, causing a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to the targeted device. A successful exploit could allow the attacker to cause a reload, resulting in a DoS condition.

Affected products

• Cisco RV340 Dual WAN Gigabit VPN Router Firmware: before 1.0.03.18 (fixed in 1.0.03.18)
• Cisco RV340W Dual WAN Gigabit Wireless-Ac VPN Router Firmware: before 1.0.03.18 (fixed in 1.0.03.18)
• Cisco RV345 Dual WAN Gigabit VPN Router Firmware: before 1.0.03.18 (fixed in 1.0.03.18)
• Cisco RV345P Dual WAN Gigabit Poe VPN Router Firmware: before 1.0.03.18 (fixed in 1.0.03.18)

Published 2020-07-16. Last modified 2026-06-17.