high
7.5
CWE
400
Advisory Published
Updated

CVE-2024-20502: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Denial of Service Vulnerability

First published: Wed Oct 02 2024(Updated: )

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
All of
Cisco Meraki MX65>=17.6.0<18.211.2
Cisco Meraki MX65 Firmware
All of
Cisco Meraki MX64 Firmware>=17.6.0<18.211.2
Cisco Meraki MX64 Firmware
All of
Cisco Meraki z4c firmware>=16.2<18.211.2
Cisco Meraki z4c firmware
All of
Cisco Meraki z4 firmware>=16.2<18.211.2
Cisco Meraki z4
All of
cisco meraki z3c firmware>=16.2<18.211.2
cisco meraki z3c
All of
cisco meraki z3 firmware>=16.2<18.211.2
Cisco Meraki Z Series Teleworker Gateway
All of
Cisco Meraki vmx firmware>=16.2<18.211.2
Cisco Meraki vmx firmware
All of
Cisco Meraki MX600 Firmware>=16.2<18.211.2
Cisco Meraki MX600 Firmware
All of
Cisco Meraki MX450 Firmware>=16.2<18.211.2
Cisco Meraki MX450 Firmware
All of
Cisco Meraki MX400 Firmware>=16.2<18.211.2
Cisco Meraki MX400
All of
Cisco Meraki MX250 Firmware>=16.2<18.211.2
Cisco Meraki MX250 Firmware
All of
Cisco Meraki MX105 Firmware>=16.2<18.211.2
Cisco Meraki MX105 Firmware
All of
Cisco Meraki MX100>=16.2<18.211.2
Cisco Meraki MX100
All of
Cisco Meraki MX95 Firmware>=16.2<18.211.2
Cisco Meraki MX95 Firmware
All of
Cisco Meraki MX85 Firmware>=16.2<18.211.2
Cisco Meraki MX85 Firmware
All of
Cisco Meraki MX84 Firmware>=16.2<18.211.2
Cisco Meraki MX84 Firmware
All of
Cisco Meraki MX75>=16.2<18.211.2
Cisco Meraki MX75
All of
cisco meraki mx68w firmware>=16.2<18.211.2
cisco meraki mx68w
All of
cisco meraki mx68cw firmware>=16.2<18.211.2
cisco meraki mx68cw
All of
Cisco Meraki MX68 Firmware>=16.2<18.211.2
Cisco Meraki MX68 Firmware
All of
cisco meraki mx67w firmware>=16.2<18.211.2
cisco meraki mx67w
All of
Cisco Meraki MX67C Firmware>=16.2<18.211.2
Cisco Meraki MX67C Firmware
All of
Cisco Meraki MX67 Firmware>=16.2<18.211.2
Cisco Meraki MX67 Firmware
All of
cisco meraki mx65w firmware>=16.2<18.211.2
cisco meraki mx65w
All of
cisco meraki mx64w firmware>=16.2<18.211.2
cisco meraki mx64w

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-20502?

    CVE-2024-20502 has a Medium severity level, as it can allow unauthenticated remote attackers to cause a denial-of-service condition on affected devices.

  • How do I fix CVE-2024-20502?

    To fix CVE-2024-20502, update the affected Cisco Meraki devices to firmware versions 18.211.2 or later.

  • Which Cisco Meraki devices are affected by CVE-2024-20502?

    CVE-2024-20502 affects various models including the Cisco Meraki MX series and Z series Teleworker Gateway devices.

  • What type of vulnerability is CVE-2024-20502?

    CVE-2024-20502 is classified as a denial-of-service vulnerability due to insufficient resource management.

  • Is it necessary to take immediate action on CVE-2024-20502?

    Yes, it is necessary to take immediate action by updating the firmware to prevent potential denial-of-service attacks.

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