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HIGH · 8.6

CVE-2024-20499

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 condi...

Vulnerability 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 Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
CiscoMeraki Z4C Firmware>= 16.2, < 18.211.2
CiscoMeraki Z4C-
CiscoMeraki Z4 Firmware>= 16.2, < 18.211.2
CiscoMeraki Z4-
CiscoMeraki Z3C Firmware>= 16.2, < 18.211.2
CiscoMeraki Z3C-
CiscoMeraki Z3 Firmware>= 16.2, < 18.211.2
CiscoMeraki Z3-
CiscoMeraki Vmx Firmware>= 16.2, < 18.211.2
CiscoMeraki Vmx-
CiscoMeraki Mx600 Firmware>= 16.2, < 18.211.2
CiscoMeraki Mx600-
CiscoMeraki Mx450 Firmware>= 16.2, < 18.211.2
CiscoMeraki Mx450-
CiscoMeraki Mx400 Firmware>= 16.2, < 18.211.2
CiscoMeraki Mx400-
CiscoMeraki Mx250 Firmware>= 16.2, < 18.211.2
CiscoMeraki Mx250-
CiscoMeraki Mx105 Firmware>= 16.2, < 18.211.2
CiscoMeraki Mx105-

Related Weaknesses (CWE)

CWE-787

References

FAQ

What is CVE-2024-20499?

CVE-2024-20499 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 condi...

How severe is CVE-2024-20499?

CVE-2024-20499 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2024-20499?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Meraki Z4C Firmware, Cisco Meraki Z4C, Cisco Meraki Z4 Firmware, Cisco Meraki Z4, Cisco Meraki Z3C Firmware.