cisco-sa-meraki-mx-vpn-dos-vnESbgBf: Cisco Meraki MX and Z3 Teleworker Gateway VPN Denial of Service Vulnerability

First published: Wed Oct 19 2022(Updated: )

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. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vnESbgBf

Credit: This vulnerability was found during the resolution a Cisco Meraki support case

Affected Software	Affected Version	How to fix
Cisco Meraki MX Firmware	=17.x<17.10.1=16.2 and later<16.16.6	17.10.1 16.16.6

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vnESbgBf (Advisory)

Child vulnerabilities

(Contains the following vulnerabilities)

CVE-2022-20933

agent/type
agent/last-modified-date
agent/softwarecombine
agent/first-publish-date
collector/cisco-advisory
source/Cisco
agent/software-canonical-lookup
agent/references
agent/weakness
agent/author
agent/title
agent/severity
agent/tags
agent/description
agent/event
vendor/cisco
canonical/cisco meraki mx firmware
version/cisco meraki mx firmware/17.x
version/cisco meraki mx firmware/16.2 and later

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