CVE-2024-20502
Last modified
CVE-2024-20502 is a high-severity vulnerability rated 7.5/10 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 cause a DoS condition on an affected device. This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests to the VPN server of an affected device. EPSS estimates a 0.52% 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 cause a DoS condition on an affected device. This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.
Metrics
CVSS:3.1/AV:N/AC:L/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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