medium
5.9
CWE
362
Advisory Published
Updated

CVE-2024-20509: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Session Takeover and 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 hijack an AnyConnect VPN session or cause a denial of service (DoS) condition for individual users of the AnyConnect VPN service on an affected device. This vulnerability is due to weak entropy for handlers that are used during the VPN authentication process as well as a race condition that exists in the same process. An attacker could exploit this vulnerability by correctly guessing an authentication handler and then sending crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to take over the AnyConnect VPN session from a target user or prevent the target user from establishing an AnyConnect VPN session with the affected device.

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-2024-20509?

    CVE-2024-20509 has been classified as a high severity vulnerability.

  • What impact does CVE-2024-20509 have on devices?

    CVE-2024-20509 allows an unauthenticated, remote attacker to hijack an AnyConnect VPN session or cause a denial of service for individual users.

  • How do I fix CVE-2024-20509?

    To fix CVE-2024-20509, update the affected Cisco Meraki devices to the latest firmware version beyond 18.211.2.

  • Which devices are affected by CVE-2024-20509?

    CVE-2024-20509 affects various Cisco Meraki MX and Z Series Teleworker Gateway devices running specific firmware versions.

  • Is there a workaround for CVE-2024-20509?

    No official workaround for CVE-2024-20509 is provided, making firmware updates the primary solution.

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