CVE-2022-20933: Cisco Meraki MX100 Firmware

High severity, CVSS 8.6. EPSS: 1.1% chance of exploitation in the next 30 days.

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

  • Cisco Meraki MX100 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX105 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX250 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX400 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX450 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX600 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX64 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX64W Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX65 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX65W Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX67 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX67CW Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX67W Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX68 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX68CW Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX68W Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX75 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX84 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX85 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki MX95 Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki Vmx Firmware: from 16.2.0, before 16.16.6 (fixed in 16.16.6); from 17.0.0, before 17.10.1 (fixed in 17.10.1)
  • Cisco Meraki z3 Firmware: affected versions not specified
  • Cisco Meraki z3c Firmware: affected versions not specified

Published 2022-10-26. Last modified 2026-06-17.