CVE-2024-20513

Medium

Description

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.

SeverityMedium

CVSS5.8

Exploit probability39. percentile0.5%

Product

Cisco Meraki Mx65 Firmware

PublishedOct 2, 2024

First seenOct 2, 2024

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

cisco meraki_mx65_firmware18.211.2 or later
cisco meraki_mx64_firmware18.211.2 or later
cisco meraki_z4c_firmware18.211.2 or later
cisco meraki_z4_firmware18.211.2 or later
cisco meraki_z3c_firmware18.211.2 or later
cisco meraki_z3_firmware18.211.2 or later
cisco meraki_vmx_firmware18.211.2 or later
cisco meraki_mx600_firmware18.211.2 or later
cisco meraki_mx450_firmware18.211.2 or later
cisco meraki_mx400_firmware18.211.2 or later
cisco meraki_mx250_firmware18.211.2 or later
cisco meraki_mx105_firmware18.211.2 or later

Affected products

Product	Affected versions	Fixed in
cisco meraki_mx65_firmware	17.6.0 ≤ v < 18.211.2	18.211.2
cisco meraki_mx64_firmware	17.6.0 ≤ v < 18.211.2	18.211.2
cisco meraki_z4c_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_z4_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_z3c_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_z3_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_vmx_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx600_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx450_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx400_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx250_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx105_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx100_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx95_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx85_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx84_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx75_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx68w_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx68cw_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx68_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx67w_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx67c_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx67_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx65w_firmware	16.2 ≤ v < 18.211.2	18.211.2
cisco meraki_mx64w_firmware	16.2 ≤ v < 18.211.2	18.211.2

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