Cisco Meraki 16.2 / 17 / 18.1 < 18.1.07.12 / 18.2 < 18.2.11.4 / 19.1 < 19.1.4 DoS (cisco-sa-meraki-mx-vpn-dos-vNRpDvfb)

high Nessus Plugin ID 241196

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Synopsis

The remote Cisco Meraki device is potentially missing one or more security-related updates.

Description

The version of the remote Cisco Meraki device is 16.2, 17, 18.1 prior to 18.1.07.12, 18.2 prior to 18.2.11.4, or 19.1 prior to 19.1.4. It is, therefore, potentially affected by a denial of service vulnerability as referenced in the cisco-sa-meraki-mx-vpn-dos-vNRpDvfb advisory:

- A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device. This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN sessions and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.
Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers without manual intervention.
(CVE-2025-20212)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Cisco Meraki version 18.1.07.12, 18.2.11.4, or 19.1.4 or later.

Plugin Details

Severity: High

ID: 241196

File Name: cisco_meraki_cisco-sa-meraki-mx-vpn-dos-vNRpDvfb.nasl

Version: 1.2

Type: remote

Family: CISCO

Published: 7/2/2025

Updated: 7/2/2025

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2025-20212

CVSS v3

Risk Factor: High

Base Score: 7.7

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

Vulnerability Information

CPE: cpe:/h:cisco:meraki

Required KB Items: Settings/ParanoidReport, installed_sw/Cisco Meraki

Patch Publication Date: 4/2/2025

Vulnerability Publication Date: 4/2/2025

Reference Information

CVE: CVE-2025-20212

Detections

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