CVE-2024-20499
Last modified
CVE-2024-20499 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Multiple vulnerabilities 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 in the AnyConnect service on an affected device. These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. EPSS estimates a 0.51% chance of exploitation in the next 30 days.
Description
Multiple vulnerabilities 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 in the AnyConnect service on an affected device. These vulnerabilities are due to insufficient validation of client-supplied parameters while establishing an SSL VPN session. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN connections and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established. 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 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 Mx65 Firmware | >= 17.6.0, < 18.211.2 |
| Cisco | Meraki Mx64w Firmware | >= 16.2, < 18.211.2 |
| Cisco | Meraki Mx64 Firmware | >= 17.6.0, <= 18.211.2 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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