Cisco Dual WAN Gigabit VPN Routers < SSL RCE and DoS (cisco-sa-sb-rce-dos-9ZAjkx4)

critical Nessus Plugin ID 140452
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VPR Score: 5.9


The remote device is missing a vendor-supplied security patch


According to its self-reported version, Cisco Small Business RV Series Router Firmware is affected by a RCE and DoS vulnerability in the Secure Sockets Layer (SSL) VPN feature due to improper validation of HTTP requests. By sending a crafted HTTP request to the device, an unauthenticated, remote attacker could execute arbitrary code or cause the device to reload, resulting in a denial of service (DoS) condition.

Please see the included Cisco BID and Cisco Security Advisory for more information.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvu36543

See Also

Plugin Details

Severity: Critical

ID: 140452

File Name: cisco-sa-sb-rce-dos-9ZAjkx4.nasl

Version: 1.12

Type: remote

Family: CISCO

Published: 9/9/2020

Updated: 3/29/2021

Dependencies: cisco_small_business_detect.nasl, cisco_rv_webui_detect.nbin

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Critical

VPR Score: 5.9

CVSS Score Source: CVE-2020-3357

CVSS v2.0

Base Score: 10

Temporal Score: 7.4

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: x-cpe:/o:cisco:small_business_rv_series_router_firmware

Required KB Items: Cisco/Small_Business_Router/Version, Cisco/Small_Business_Router/Model, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 7/15/2020

Vulnerability Publication Date: 7/15/2020

Reference Information

CVE: CVE-2020-3357


CISCO-SA: cisco-sa-sb-rce-dos-9ZAjkx4

CWE: 20