CVE-2020-3357: Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Remote Code Execution and Denial of Service Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-16 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device or cause the device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because HTTP requests are not properly validated. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to an affected device. A successful exploit could allow the attacker to remotely execute arbitrary code on the device or cause the device to 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

How to fix

Upgrade to a fixed version: Cisco Rv340 Dual Wan Gigabit Vpn Router Firmware 1.0.03.18; Cisco Rv340W Dual Wan Gigabit Wireless-Ac Vpn Router Firmware 1.0.03.18; Cisco Rv345 Dual Wan Gigabit Vpn Router Firmware 1.0.03.18; Cisco Rv345P Dual Wan Gigabit Poe Vpn Router Firmware 1.0.03.18. Check the vendor advisory for mitigations.

References

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