What’s Vulnerable › Vulnerabilities

CVE-2022-20933: Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability

Description

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z3 Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit this vulnerability by crafting a malicious request and sending it to the affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to crash and restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention. Cisco Meraki has released software updates that address this vulnerability.

Affected products

How to fix

Upgrade to a fixed version: Cisco Meraki Mx100 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx105 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx250 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx400 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx450 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx600 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx64 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx64W Firmware 16.16.6, 17.10.1; Cisco Meraki Mx65 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx65W Firmware 16.16.6, 17.10.1; Cisco Meraki Mx67 Firmware 16.16.6, 17.10.1; Cisco Meraki Mx67Cw Firmware 16.16.6, 17.10.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-20933 or the next vulnerability affects your stack