CVE-2020-3357

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

CRITICAL
9.8
CVSS Score
Published: July 16, 2020 at 05:21 PM UTC
Updated: June 17, 2026 at 03:18 AM UTC
13 products affected across 1 vendorRV345 Dual WAN Gigabit VPN Router FirmwareRV340W Dual WAN Gigabit Wireless Ac VPN Router FirmwareRV345P Dual WAN Gigabit POE VPN Router Firmware

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Severity
CRITICAL9.8
Exploit prediction
EPSS 4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
cisco-rv340-dual-wan-gigabit-vpn-router (same device)
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
cisco-rv340w-dual-wan-gigabit-wireless-ac-vpn-router (same device)
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
cisco-rv345-dual-wan-gigabit-vpn-router (same device)
v < 1.0.03.18
Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement
cisco-rv345p-dual-wan-gigabit-poe-vpn-router (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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