CVE-2024-20499

HIGH EPSS 39.5%

Published Oct 2, 20241y ago · Modified Jun 17, 20261w ago

7.5 CVSS 3.1

High

Published Oct 2, 2024 1y ago

Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score

7.5

Exploitability

3.9

Impact

3.6

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

39.5% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 50

Vendor	Product	Version	Range
cisco	meraki_z4c_firmware	*	≥16.2 – <18.211.2
cisco	meraki_z4c	*	any
cisco	meraki_z4_firmware	*	≥16.2 – <18.211.2
cisco	meraki_z4	*	any
cisco	meraki_z3c_firmware	*	≥16.2 – <18.211.2
cisco	meraki_z3c	*	any
cisco	meraki_z3_firmware	*	≥16.2 – <18.211.2
cisco	meraki_z3	*	any
cisco	meraki_vmx_firmware	*	≥16.2 – <18.211.2
cisco	meraki_vmx	*	any
cisco	meraki_mx600_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx600	*	any
cisco	meraki_mx450_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx450	*	any
cisco	meraki_mx400_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx400	*	any
cisco	meraki_mx250_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx250	*	any
cisco	meraki_mx105_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx105	*	any
cisco	meraki_mx100_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx100	*	any
cisco	meraki_mx95_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx95	*	any
cisco	meraki_mx85_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx85	*	any
cisco	meraki_mx84_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx84	*	any
cisco	meraki_mx75_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx75	*	any
cisco	meraki_mx68w_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx68w	*	any
cisco	meraki_mx68cw_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx68cw	*	any
cisco	meraki_mx68_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx68	*	any
cisco	meraki_mx67w_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx67w	*	any
cisco	meraki_mx67c_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx67c	*	any
cisco	meraki_mx67_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx67	*	any
cisco	meraki_mx65w_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx65w	*	any
cisco	meraki_mx65_firmware	*	≥17.6.0 – <18.211.2
cisco	meraki_mx65	*	any
cisco	meraki_mx64w_firmware	*	≥16.2 – <18.211.2
cisco	meraki_mx64w	*	any
cisco	meraki_mx64_firmware	*	≥17.6.0 – ≤18.211.2
cisco	meraki_mx64	*	any

References 1

sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2

Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.