CVE-2024-20498: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Denial of Service Vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2024-20498?
CVE-2024-20498 has a high severity rating, indicating it could potentially allow an attacker to cause a Denial of Service (DoS) condition.
How do I fix CVE-2024-20498?
To fix CVE-2024-20498, it is recommended to update affected Cisco Meraki MX and Z Series firmware to versions beyond 18.211.2 or apply any related security patches.
What devices are affected by CVE-2024-20498?
CVE-2024-20498 affects multiple models of Cisco Meraki MX and Z Series Teleworker Gateway devices running specific firmware versions between 16.2 and 18.211.2.
Can CVE-2024-20498 be exploited remotely?
Yes, CVE-2024-20498 can be exploited by an unauthenticated remote attacker.
What type of attack does CVE-2024-20498 facilitate?
CVE-2024-20498 facilitates a Denial of Service (DoS) attack on the AnyConnect service of affected Cisco devices.