CVE-2024-20502: 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 on an affected device.
This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests 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-2024-20502?
CVE-2024-20502 has a Medium severity level, as it can allow unauthenticated remote attackers to cause a denial-of-service condition on affected devices.
How do I fix CVE-2024-20502?
To fix CVE-2024-20502, update the affected Cisco Meraki devices to firmware versions 18.211.2 or later.
Which Cisco Meraki devices are affected by CVE-2024-20502?
CVE-2024-20502 affects various models including the Cisco Meraki MX series and Z series Teleworker Gateway devices.
What type of vulnerability is CVE-2024-20502?
CVE-2024-20502 is classified as a denial-of-service vulnerability due to insufficient resource management.
Is it necessary to take immediate action on CVE-2024-20502?
Yes, it is necessary to take immediate action by updating the firmware to prevent potential denial-of-service attacks.