CVE-2024-20500

published 2024-10-02

CVE-2024-20500: A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated…

Priority P3 44 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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 in the AnyConnect service on an affected device.

This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages 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.

Affected

27 ranges · showing 25

Vendor	Product	Version range	Fixed in
cisco	cisco_meraki_mx_firmware	—	—
cisco	meraki_mx100_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx105_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx250_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx400_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx450_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx600_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx64_firmware	17.6.0 – 18.211.2	—
cisco	meraki_mx64w_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx65_firmware	>= 17.6.0 < 18.211.2	18.211.2
cisco	meraki_mx65w_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx67_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx67c_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx67w_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx68_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx68cw_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx68w_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx75_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx84_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx85_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx95_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_mx_and_z_series_teleworker_gateway_anyconnect_vpn	—	—
cisco	meraki_vmx_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_z3_firmware	>= 16.2 < 18.211.2	18.211.2
cisco	meraki_z3c_firmware	>= 16.2 < 18.211.2	18.211.2

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

vendor_cisco 8.6 HIGH

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