CVE-2024-20513

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 for targeted users of the AnyConnect service on an affected device. This vulnerability is due to insufficient entropy for handlers that are used during SSL VPN session establishment. An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate.

• cisco meraki mx65 firmware (>= 17.6.0 < 18.211.2) • cisco meraki mx64 firmware (>= 17.6.0 < 18.211.2) • cisco meraki z4c firmware (>= 16.2 < 18.211.2) • cisco meraki z4 firmware (>= 16.2 < 18.211.2) • cisco meraki z3c firmware (>= 16.2 < 18.211.2) • cisco meraki z3 firmware (>= 16.2 < 18.211.2) • cisco meraki vmx firmware (>= 16.2 < 18.211.2) • cisco meraki mx600 firmware (>= 16.2 < 18.211.2) • cisco meraki mx450 firmware (>= 16.2 < 18.211.2) • cisco meraki mx400 firmware (>= 16.2 < 18.211.2) • cisco meraki mx250 firmware (>= 16.2 < 18.211.2) • cisco meraki mx105 firmware (>= 16.2 < 18.211.2) • cisco meraki mx100 firmware (>= 16.2 < 18.211.2) • cisco meraki mx95 firmware (>= 16.2 < 18.211.2) • cisco meraki mx85 firmware (>= 16.2 < 18.211.2) • cisco meraki mx84 firmware (>= 16.2 < 18.211.2) • cisco meraki mx75 firmware (>= 16.2 < 18.211.2) • cisco meraki mx68w firmware (>= 16.2 < 18.211.2) • cisco meraki mx68cw firmware (>= 16.2 < 18.211.2) • cisco meraki mx68 firmware (>= 16.2 < 18.211.2) • cisco meraki mx67w firmware (>= 16.2 < 18.211.2) • cisco meraki mx67c firmware (>= 16.2 < 18.211.2) • cisco meraki mx67 firmware (>= 16.2 < 18.211.2) • cisco meraki mx65w firmware (>= 16.2 < 18.211.2) • cisco meraki mx64w firmware (>= 16.2 < 18.211.2)