high
8.6
CWE
234
Advisory Published
Updated

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

First published: Wed Oct 26 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Meraki MX64 Firmware>=16.2.0<16.16.6
Cisco Meraki MX64 Firmware>=17.0.0<17.10.1
Cisco Meraki MX64 Firmware
cisco meraki mx64w firmware>=16.2.0<16.16.6
cisco meraki mx64w firmware>=17.0.0<17.10.1
cisco meraki mx64w
Cisco Meraki MX65>=16.2.0<16.16.6
Cisco Meraki MX65>=17.0.0<17.10.1
Cisco Meraki MX65 Firmware
cisco meraki mx65w firmware>=16.2.0<16.16.6
cisco meraki mx65w firmware>=17.0.0<17.10.1
cisco meraki mx65w
Cisco Meraki MX67 Firmware>=16.2.0<16.16.6
Cisco Meraki MX67 Firmware>=17.0.0<17.10.1
Cisco Meraki MX67 Firmware
cisco meraki mx67cw firmware>=16.2.0<16.16.6
cisco meraki mx67cw firmware>=17.0.0<17.10.1
cisco meraki mx67cw
cisco meraki mx67w firmware>=16.2.0<16.16.6
cisco meraki mx67w firmware>=17.0.0<17.10.1
cisco meraki mx67w
Cisco Meraki MX68 Firmware>=16.2.0<16.16.6
Cisco Meraki MX68 Firmware>=17.0.0<17.10.1
Cisco Meraki MX68 Firmware
cisco meraki mx68cw firmware>=16.2.0<16.16.6
cisco meraki mx68cw firmware>=17.0.0<17.10.1
cisco meraki mx68cw
cisco meraki mx68w firmware>=16.2.0<16.16.6
cisco meraki mx68w firmware>=17.0.0<17.10.1
cisco meraki mx68w
Cisco Meraki MX75>=16.2.0<16.16.6
Cisco Meraki MX75>=17.0.0<17.10.1
Cisco Meraki MX75
Cisco Meraki MX84 Firmware>=16.2.0<16.16.6
Cisco Meraki MX84 Firmware>=17.0.0<17.10.1
Cisco Meraki MX84 Firmware
Cisco Meraki MX85 Firmware>=16.2.0<16.16.6
Cisco Meraki MX85 Firmware>=17.0.0<17.10.1
Cisco Meraki MX85 Firmware
Cisco Meraki MX95 Firmware>=16.2.0<16.16.6
Cisco Meraki MX95 Firmware>=17.0.0<17.10.1
Cisco Meraki MX95 Firmware
Cisco Meraki MX100>=16.2.0<16.16.6
Cisco Meraki MX100>=17.0.0<17.10.1
Cisco Meraki MX100
Cisco Meraki MX105 Firmware>=16.2.0<16.16.6
Cisco Meraki MX105 Firmware>=17.0.0<17.10.1
Cisco Meraki MX105 Firmware
Cisco Meraki MX250 Firmware>=16.2.0<16.16.6
Cisco Meraki MX250 Firmware>=17.0.0<17.10.1
Cisco Meraki MX250 Firmware
Cisco Meraki MX400 Firmware>=16.2.0<16.16.6
Cisco Meraki MX400 Firmware>=17.0.0<17.10.1
Cisco Meraki MX400
Cisco Meraki MX450 Firmware>=16.2.0<16.16.6
Cisco Meraki MX450 Firmware>=17.0.0<17.10.1
Cisco Meraki MX450 Firmware
Cisco Meraki MX600 Firmware>=16.2.0<16.16.6
Cisco Meraki MX600 Firmware>=17.0.0<17.10.1
Cisco Meraki MX600 Firmware
Cisco Meraki vmx firmware>=16.2.0<16.16.6
Cisco Meraki vmx firmware>=17.0.0<17.10.1
Cisco Meraki vmx firmware
cisco meraki z3c firmware
cisco meraki z3c
cisco meraki z3 firmware
Cisco Meraki Z Series Teleworker Gateway

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2022-20933?

    CVE-2022-20933 is classified as a high-severity vulnerability due to its potential to allow unauthorized remote attackers to cause a denial of service (DoS).

  • How do I exploit CVE-2022-20933?

    Exploiting CVE-2022-20933 involves sending specially crafted packets to affected Cisco devices, resulting in a denial of service condition.

  • Which devices are affected by CVE-2022-20933?

    CVE-2022-20933 affects various Cisco Meraki MX and Z3 Teleworker Gateway devices running specific firmware versions.

  • How do I fix CVE-2022-20933?

    To fix CVE-2022-20933, update the affected Cisco Meraki MX and Z3 devices to the latest firmware versions recommended by Cisco.

  • Is there a workaround for CVE-2022-20933?

    While there are no official workarounds for CVE-2022-20933, disabling the VPN service can mitigate the risk until a patch is applied.

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