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CVE-2020-3358

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

HIGH

8.6

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

HIGH8.6

Exploit prediction

EPSS 1%

SSVC

No known exploit

Description

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

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

RV340 Dual WAN Gigabit VPN Router Firmware · Cisco

95%

v < 1.0.03.18

Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement

RV340W Dual WAN Gigabit Wireless Ac VPN Router Firmware · Cisco

95%

v < 1.0.03.18

Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement

RV345 Dual WAN Gigabit VPN Router Firmware · Cisco

95%

v < 1.0.03.18

Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement

RV345P Dual WAN Gigabit POE VPN Router Firmware · Cisco

95%

v < 1.0.03.18

Affected range stops below 1.0.03.18, so it looks safe — our inference, not a vendor statement

90%

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)

RV340W · Cisco

90%

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)

90%

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)

RV345P · Cisco

90%

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)

Small Business Rv Series Router Firmware · Cisco

60%

All versions

Rv340 Dual Wan Gigabit Vpn Router · Ciscodevice

80%

All versions

Remediation

No guide yet

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

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-dos-ZN5GvNH7

References (1)

Vendor Advisoryx_refsource_CISCO

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-dos-ZN5GvNH7

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

8.6HIGHcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-20

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