Vulnerability 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. 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Meraki Mx65 Firmware | >= 17.6.0, < 18.211.2 |
| Cisco | Meraki Mx65 | - |
| Cisco | Meraki Mx64 Firmware | >= 17.6.0, < 18.211.2 |
| Cisco | Meraki Mx64 | - |
| Cisco | Meraki Z4C Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Z4C | - |
| Cisco | Meraki Z4 Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Z4 | - |
| Cisco | Meraki Z3C Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Z3C | - |
| Cisco | Meraki Z3 Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Z3 | - |
| Cisco | Meraki Vmx Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Vmx | - |
| Cisco | Meraki Mx600 Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Mx600 | - |
| Cisco | Meraki Mx450 Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Mx450 | - |
| Cisco | Meraki Mx400 Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Mx400 | - |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2024-20513?
CVE-2024-20513 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 ...
How severe is CVE-2024-20513?
CVE-2024-20513 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-20513?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Meraki Mx65 Firmware, Cisco Meraki Mx65, Cisco Meraki Mx64 Firmware, Cisco Meraki Mx64, Cisco Meraki Z4C Firmware.