Vulnerability Monitor

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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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and limited availability for affected systems. Impacting 50 products from cisco, from cisco, from cisco and 47 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2024, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2024-10-02T19:15:15.210

Last Modified

2025-06-04T21:15:37.183

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.8 (MEDIUM)

Weaknesses
  • Type: Secondary
    CWE-639
  • Type: Primary
    CWE-639
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco meraki_mx65_firmware < 18.211.2 Yes
Hardware cisco meraki_mx65 - No
Operating System cisco meraki_mx64_firmware < 18.211.2 Yes
Hardware cisco meraki_mx64 - No
Operating System cisco meraki_z4c_firmware < 18.211.2 Yes
Hardware cisco meraki_z4c - No
Operating System cisco meraki_z4_firmware < 18.211.2 Yes
Hardware cisco meraki_z4 - No
Operating System cisco meraki_z3c_firmware < 18.211.2 Yes
Hardware cisco meraki_z3c - No
Operating System cisco meraki_z3_firmware < 18.211.2 Yes
Hardware cisco meraki_z3 - No
Operating System cisco meraki_vmx_firmware < 18.211.2 Yes
Hardware cisco meraki_vmx - No
Operating System cisco meraki_mx600_firmware < 18.211.2 Yes
Hardware cisco meraki_mx600 - No
Operating System cisco meraki_mx450_firmware < 18.211.2 Yes
Hardware cisco meraki_mx450 - No
Operating System cisco meraki_mx400_firmware < 18.211.2 Yes
Hardware cisco meraki_mx400 - No
Operating System cisco meraki_mx250_firmware < 18.211.2 Yes
Hardware cisco meraki_mx250 - No
Operating System cisco meraki_mx105_firmware < 18.211.2 Yes
Hardware cisco meraki_mx105 - No
Operating System cisco meraki_mx100_firmware < 18.211.2 Yes
Hardware cisco meraki_mx100 - No
Operating System cisco meraki_mx95_firmware < 18.211.2 Yes
Hardware cisco meraki_mx95 - No
Operating System cisco meraki_mx85_firmware < 18.211.2 Yes
Hardware cisco meraki_mx85 - No
Operating System cisco meraki_mx84_firmware < 18.211.2 Yes
Hardware cisco meraki_mx84 - No
Operating System cisco meraki_mx75_firmware < 18.211.2 Yes
Hardware cisco meraki_mx75 - No
Operating System cisco meraki_mx68w_firmware < 18.211.2 Yes
Hardware cisco meraki_mx68w - No
Operating System cisco meraki_mx68cw_firmware < 18.211.2 Yes
Hardware cisco meraki_mx68cw - No
Operating System cisco meraki_mx68_firmware < 18.211.2 Yes
Hardware cisco meraki_mx68 - No
Operating System cisco meraki_mx67w_firmware < 18.211.2 Yes
Hardware cisco meraki_mx67w - No
Operating System cisco meraki_mx67c_firmware < 18.211.2 Yes
Hardware cisco meraki_mx67c - No
Operating System cisco meraki_mx67_firmware < 18.211.2 Yes
Hardware cisco meraki_mx67 - No
Operating System cisco meraki_mx65w_firmware < 18.211.2 Yes
Hardware cisco meraki_mx65w - No
Operating System cisco meraki_mx64w_firmware < 18.211.2 Yes
Hardware cisco meraki_mx64w - No
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.