{"cve":"CVE-2024-20513","nvd":{"published":"2024-10-02T19:15:15.210","modified":"2026-06-17T07:07:28.383","status":"Modified","description":"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.\r\n\n 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-639"],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2"],"products":["cisco:meraki_mx100_firmware","cisco:meraki_mx105_firmware","cisco:meraki_mx250_firmware","cisco:meraki_mx400_firmware","cisco:meraki_mx450_firmware","cisco:meraki_mx600_firmware","cisco:meraki_mx64_firmware","cisco:meraki_mx64w_firmware","cisco:meraki_mx65_firmware","cisco:meraki_mx65w_firmware","cisco:meraki_mx67_firmware","cisco:meraki_mx67c_firmware","cisco:meraki_mx67w_firmware","cisco:meraki_mx68_firmware","cisco:meraki_mx68cw_firmware","cisco:meraki_mx68w_firmware","cisco:meraki_mx75_firmware","cisco:meraki_mx84_firmware","cisco:meraki_mx85_firmware","cisco:meraki_mx95_firmware","cisco:meraki_vmx_firmware","cisco:meraki_z3_firmware","cisco:meraki_z3c_firmware","cisco:meraki_z4_firmware","cisco:meraki_z4c_firmware"],"source":"nvd","synced_at":"2026-10-19T21:55:31.737901711+00:00"},"epss":{"cve":"CVE-2024-20513","score":0.00452,"percentile":0.39262,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}