CVE-2024-20509
Last modified
CVE-2024-20509 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 0.37% chance of exploitation in the next 30 days.
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 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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| 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 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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