high
8.6
CWE
787
Advisory Published
Updated

CVE-2024-20499: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Denial of Service Vulnerability

First published: Wed Oct 02 2024(Updated: )

Multiple vulnerabilities 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 in the AnyConnect service on an affected device. These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
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 MX65>=17.6.0<18.211.2
Cisco Meraki MX65 Firmware
All of
cisco meraki mx64w firmware>=16.2<18.211.2
cisco meraki mx64w
All of
Cisco Meraki MX64 Firmware>=17.6.0<=18.211.2
Cisco Meraki MX64 Firmware

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-20499?

    The severity of CVE-2024-20499 is critical as it allows an unauthenticated remote attacker to cause a denial of service in the Cisco AnyConnect VPN service.

  • How do I fix CVE-2024-20499?

    To fix CVE-2024-20499, upgrade affected Cisco Meraki devices to the latest firmware version that addresses the vulnerability.

  • Which devices are affected by CVE-2024-20499?

    Devices affected by CVE-2024-20499 include Cisco Meraki MX and Z Series Teleworker Gateway devices running specific firmware versions between 16.2 and 18.211.2.

  • What impact does CVE-2024-20499 have on Cisco Meraki devices?

    CVE-2024-20499 can lead to a Denial of Service (DoS) condition, disrupting the functionality of the Cisco AnyConnect service on affected devices.

  • Is there a workaround for CVE-2024-20499?

    There are no known workarounds for CVE-2024-20499; the primary mitigation is to apply the recommended firmware updates.

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