CVE-2024-20513

published 2024-10-02

CVE-2024-20513: 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 P4 30 medium 5.3 CVSS 3.1

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

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 for targeted users of the AnyConnect service on an affected device.

This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.

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	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 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

vendor_cisco 8.6 HIGH

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