CVE-2024-20500: Cisco Meraki MX and Z3 Teleworker Gateway AnyConnect VPN Denial of Service Vulnerability
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 in the AnyConnect service on an affected device.
This vulnerability is due to insufficient resource management when establishing TLS/SSL sessions. An attacker could exploit this vulnerability by sending a series of crafted TLS/SSL messages to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted.
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-2024-20500?
CVE-2024-20500 has been classified with a high severity due to its potential to allow remote attackers to cause a denial of service (DoS) condition.
How do I fix CVE-2024-20500?
To mitigate CVE-2024-20500, upgrade the affected Cisco Meraki MX and Z Series devices to firmware version 18.211.2 or higher.
Which Cisco devices are affected by CVE-2024-20500?
CVE-2024-20500 affects several Cisco Meraki MX and Z Series devices, including MX100, MX250, MX450, and others running vulnerable firmware versions.
Can CVE-2024-20500 be exploited by authenticated users?
No, CVE-2024-20500 can be exploited by unauthenticated remote attackers.
What kind of impact can CVE-2024-20500 have on my network?
Exploitation of CVE-2024-20500 can lead to a denial of service on the AnyConnect VPN service, potentially disrupting business operations.