Is CVE-2020-3357 actively exploited?

No active exploitation of CVE-2020-3357 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-3357 be exploited remotely?

Yes. CVE-2020-3357 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-3357?

CVE-2020-3357 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-3357

CRITICAL

CVE-2020-3357

CWE-20Published: July 16, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-3357 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Cisco8 product(s)

rv340 dual wan gigabit vpn router firmwarerv340 dual wan gigabit vpn routerrv340w dual wan gigabit wireless-ac vpn router firmwarerv340w dual wan gigabit wireless-ac vpn routerrv345 dual wan gigabit vpn router firmwarerv345 dual wan gigabit vpn routerrv345p dual wan gigabit poe vpn router firmwarerv345p dual wan gigabit poe vpn router

Source: NVD CPE · 8 total CPE entries