CVE-2024-20509

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 hijack an AnyConnect VPN session or cause a denial of service (DoS) condition for individual users of the AnyConnect VPN service on an affected device. This vulnerability is due to weak entropy for handlers that are used during the VPN authentication process as well as a race condition that exists in the same process. An attacker could exploit this vulnerability by correctly guessing an authentication handler and then sending crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to take over the AnyConnect VPN session from a target user or prevent the target user from establishing an AnyConnect VPN session with the affected device. It has a CVSS v3.1 base score of 5.8 (MEDIUM).

CVE-2024-20509 has a CVSS v3.1 score of 5.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

CVE-2024-20509 affects products from cisco, specifically: meraki_mx100, meraki_mx100_firmware, meraki_mx105, meraki_mx105_firmware, meraki_mx250, meraki_mx250_firmware, meraki_mx400, meraki_mx400_firmware, meraki_mx450, meraki_mx450_firmware, meraki_mx600, meraki_mx600_firmware, meraki_mx64, meraki_mx64_firmware, meraki_mx64w, meraki_mx64w_firmware, meraki_mx65, meraki_mx65_firmware, meraki_mx65w, meraki_mx65w_firmware, meraki_mx67, meraki_mx67_firmware, meraki_mx67c, meraki_mx67c_firmware, meraki_mx67w, meraki_mx67w_firmware, meraki_mx68, meraki_mx68_firmware, meraki_mx68cw, meraki_mx68cw_firmware, meraki_mx68w, meraki_mx68w_firmware, meraki_mx75, meraki_mx75_firmware, meraki_mx84, meraki_mx84_firmware, meraki_mx85, meraki_mx85_firmware, meraki_mx95, meraki_mx95_firmware, meraki_vmx, meraki_vmx_firmware, meraki_z3, meraki_z3_firmware, meraki_z3c, meraki_z3c_firmware, meraki_z4, meraki_z4_firmware, meraki_z4c, meraki_z4c_firmware. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.